Why just have a boring soundbar when you can have a robot sitting on your desk producing high quality sound and bass?
That’s the question GravaStar asks with the Mars Pro. It looks like a mechanical spider from a sci-fi movie. It sounds like a real speaker. And it costs about $200.
But is it actually good, or is it just a cool paperweight with a price tag?
I dug into the specs, real buyer reviews, and hands-on testing reports to find out. Here’s what I found.
What Is the GravaStar Mars Pro?
The GravaStar Mars Pro is a portable Bluetooth speaker built into a zinc alloy body that looks like a mecha robot. It has telescopic legs that fold out, RGB lighting, and a touch control panel on top.
It’s not a toy. It’s a 20W speaker system with a 2.5-inch full-range woofer, a 1-inch tweeter, and a passive bass radiator. It charges via USB-C and lasts up to 15 hours on a single charge.
The Mars Pro comes in several color options: Black, White, Yellow (War-Damaged), and a Special Edition Shark version. Prices range from about $200 for the standard Black model up to $330 for special editions.
Check the current price on Amazon here.
Design and Build Quality: This Thing Is Built Like a Tank
The first thing everyone notices about the Mars Pro is the design. It doesn’t look like any other Bluetooth speaker on the market.
The body is made from zinc alloy. That’s the same kind of metal used in premium hardware. It weighs about 2.87 pounds (1.3 kg), which gives it a solid, heavy feel. Some reviewers call it too heavy to be truly portable, but that weight also means it doesn’t vibrate across your desk when the bass hits.
The legs are telescopic and foldable, with shock-absorbing tips. They give the speaker a spider-like stance that actually serves a purpose: the legs absorb vibrations so the speaker stays put even at high volume.
The hexagonal grille pattern on the front adds to the sci-fi look. The touch panel on top lets you control volume, playback, and lighting without buttons.
Bottom line on design: It’s the best-looking Bluetooth speaker I’ve seen. If you want something that starts conversations, this is it.
Sound Quality: Better Than It Has Any Right to Be
Here’s where things get interesting. Most “cool-looking” speakers sound terrible. The Mars Pro doesn’t.
The 20W system pushes out surprising volume for its size. Multiple reviewers describe it as loud enough to fill a room. The passive bass radiator gives it a thump that you feel more than you expect from a speaker this compact.
What sounds great:
- Bass-heavy music (hip-hop, EDM, gaming soundtracks)
- Game audio and explosions
- Casual listening at moderate volumes
What doesn’t sound great:
- Mids can get muddy at high volumes, especially with heavy bass tracks
- Treble lacks the clarity you’d get from a dedicated audiophile speaker
- Bass can distort at maximum volume on certain songs
The AudioReviews team noted that sub-bass boost can drown out mids, and TrustedReviews pointed out that sound quality isn’t “audiophile-level.” That’s fair. This is not a speaker for critical listening.
But for gaming, desk use, and casual music? It sounds genuinely good. The 1-inch tweeter helps keep vocals clear, and the balanced sound signature works well for most content.
One reviewer from SoundPhileReview said the advertised 15-hour battery life is “entirely realistic” at around 50% volume. That matches what other testers found.
Pros and Cons: What Buyers Need to Know
✓ Pros
- Unique sci-fi design that stands out on any desk
- Solid zinc alloy build quality (feels premium)
- 20W output with surprising bass for its size
- 15-hour battery life (confirmed by real testing)
- 6 RGB light modes including music sync
- USB-C charging with optional wireless charging base
- TWS stereo pairing with a second Mars Pro
- Aux input for zero-latency gaming
✗ Cons
- Battery and charging failures reported by some buyers
- No low-latency Bluetooth mode for competitive gaming
- Single port handles both charging and aux (can’t do both at once)
- No track skip controls (pause/play only)
- Aux connection disables TWS stereo pairing
- Port placement is awkward (under the speaker body)
- No companion app or EQ controls
- $200 to $330 is expensive for the sound quality alone
What’s Great About It
RGB Lighting: 6 modes including static colors, dynamic patterns, and music sync that pulses with your audio. The lights are subtle, not overwhelming. They add to the sci-fi look without being distracting.
Battery Life: The 8,000mAh battery pack (4 x 2,000mAh cells) delivers up to 15 hours of playtime. Real testing confirms this at around 50% volume. Battery life depends on how loud you crank it and whether the RGB lights are on.
Bluetooth 5.0: Stable connection up to about 30 feet. Works with phones, tablets, and laptops. Codec support varies by version, with some showing SBC only and newer versions adding AAC.
Stereo Pairing (TWS): Pair two Mars Pro speakers for true stereo sound. GravaStar calls it “dual-channel pairing.” It works, but there’s a catch (more on that below).
USB-C Charging: Standard USB-C charging, plus GravaStar sells a wireless charging base separately for about $60 if you want to skip cables.
Aux Input: The included USB-C to 3.5mm cable lets you connect directly to a computer or phone. Useful if you want zero latency for gaming.
What Buyers Actually Complain About
I’m not going to pretend this speaker is perfect. Real buyers have raised legitimate issues, and you should know about them before spending $200.
Battery and Charging Failures: This is the most common serious complaint. Reddit users reported units that “won’t power up,” “stopped charging,” or “died after a week.” A Best Buy reviewer said their speaker stopped holding a charge after about a year. These seem to be quality control issues rather than design flaws, but they happen often enough to be worth noting.
Bluetooth Lag for Gaming: There’s no low-latency Bluetooth mode. In single-speaker mode, latency is manageable. But in TWS stereo mode, the delay can hit half a second, which makes competitive gaming frustrating. If you’re gaming, use the aux cable.
Single Port Limitation: The Mars Pro has one port that handles both USB-C charging and the aux connection. You can’t charge and play via aux at the same time. And if you connect via aux, TWS pairing breaks, so your second speaker stops working.
No Track Skip Controls: You can pause and play, but there’s no next or previous track button. You have to use your phone to skip songs. There’s also no built-in microphone for calls and no app-based EQ.
Awkward Port Placement: The USB-C port sits underneath the speaker body. You have to flip the unit over to plug it in, which can accidentally trigger the touch volume controls.
Price: At $200 to $330 depending on the version, it’s not cheap. Multiple reviewers called it “expensive.” You’re paying a premium for the design, not just the sound.
Who Should Buy the GravaStar Mars Pro
This speaker is perfect for you if:
- You want a desk speaker that looks like nothing else. The Mars Pro is a statement piece. If you have a gaming setup or a cool desk arrangement, this fits right in.
- You care about design as much as sound. If you want audiophile sound, buy something else. If you want something that looks amazing and sounds good, this is it.
- You’re a gamer who wants atmosphere. The RGB lighting and bass-heavy sound profile work great for gaming sessions.
- You’re buying a gift for someone who has everything. This is one of those gifts that makes people go “what IS that?” in a good way.
- You like sci-fi and mecha aesthetics. This is basically a functional collectible.
Who Should Skip It
This speaker is not for you if:
- You want audiophile sound quality. The mids and treble aren’t at that level. Look at speakers from Sonos, Bose, or JBL instead.
- You need low-latency audio for competitive gaming. The Bluetooth lag in TWS mode is noticeable. Use aux or buy a speaker with aptX Low Latency.
- You want something truly portable. At nearly 3 pounds, it’s heavy for a portable speaker. It’s more of a “move it from desk to desk” speaker than a “throw it in your bag” speaker.
- You’re on a tight budget. $200 is a lot for a speaker that has some reliability concerns. If sound is your only priority, there are better values.
How It Compares to Other $200 Bluetooth Speakers
Here’s how the Mars Pro stacks up against two of the most popular Bluetooth speakers in the same price range.
| Feature | GravaStar Mars Pro Reviewed | JBL Charge 5 | Soundcore Motion+ |
|---|---|---|---|
| Price | ~$200 | ~$180 | ~$100 |
| Power | 20W | 40W | 30W |
| Design | Sci-fi robot | Traditional cylinder | Traditional rectangle |
| Battery | 15 hours | 20 hours | 12 hours |
| Waterproof | No | IP67 | IPX7 |
| RGB Lighting | Yes (6 modes) | No | No |
| Stereo Pairing | Yes (TWS) | Yes (PartyBoost) | Yes (TWS) |
| App / EQ | No | Yes | Yes |
| Conversation Piece | Absolutely | No | No |
Here’s the honest truth: if you just want the best sound for $200, the JBL Charge 5 and Soundcore Motion+ are better choices. They’re louder, waterproof, and have app-based EQ controls. But neither one makes someone stop and ask, “What is that thing?” The Mars Pro trades some sound performance and practical features for a design that no other speaker can match. Whether that trade is worth it depends on what you value more.
What’s in the Box
- 1 x GravaStar Mars Pro Bluetooth Speaker
- 1 x USB-C cable (for charging)
- 1 x USB-C to 3.5mm aux cable
- 1 x Instruction manual
No charging brick included. You’ll need to use a standard USB-C charger you already have.
Tips for Getting the Most Out of Your Mars Pro
- Use the aux cable for gaming. It eliminates Bluetooth latency completely and gives you the best sync between audio and on-screen action.
- Keep the volume around 50-60% for best sound quality. The bass stays controlled and the mids stay clear. Push it to max and things start to get muddy.
- Turn off RGB lights to extend battery life. The lights look cool but they drain the battery faster. If you need maximum playtime, switch them off.
- Don’t use TWS mode for gaming. The latency between two paired speakers is too high for real-time gaming. Stick to single speaker or aux mode.
- Register your warranty. Given the charging and battery complaints some users have reported, make sure you’re covered in case you get a bad unit.
Final Verdict: Is the GravaStar Mars Pro Worth It?
The Mars Pro is not the best Bluetooth speaker you can buy for $200. It’s not the loudest, the clearest, or the most practical.
But it might be the most fun.
It’s a speaker that makes you smile every time you look at it. It sounds good enough for daily use. The build quality is excellent. And it turns a boring desk into something that looks like it belongs in a sci-fi movie.
If you’re the kind of person who chooses products because they’re interesting and unique, not just because they tick every spec box, the GravaStar Mars Pro is worth every penny. For more finds in the same spirit, see our roundup of 25 Oddly Useful Products That Make Daily Life Easier.
If you want the best pure sound for your money, look elsewhere.
Ready to put a robot on your desk?
Check Price on AmazonPrice may vary. As an Amazon Associate, Oddly Useful Finds earns from qualifying purchases.
GravaStar Mars Pro FAQ
Got questions? Here are the answers buyers are searching for.
Is GravaStar a legit brand?
Yes. GravaStar is a real consumer electronics company that has been selling Bluetooth speakers since around 2021. The Mars Pro is sold on Amazon, Best Buy, and through GravaStar’s own website. It has a 4.3-star rating on Amazon with hundreds of reviews.
How loud is the GravaStar Mars Pro?
The Mars Pro outputs 20W through a dual speaker system. It’s loud enough to fill a medium-sized room. It won’t replace a dedicated sound system, but it’s more powerful than its compact size suggests.
Can you use the GravaStar Mars Pro for gaming?
Yes, but with a caveat. In Bluetooth mode, there’s no low-latency codec, so you may notice slight audio delay. For competitive gaming, use the included aux cable to eliminate lag entirely. The bass-heavy sound profile works well for game audio and explosions.
How long does the battery last?
GravaStar claims up to 15 hours. Real-world testing confirms this is accurate at around 50% volume with RGB lights off. Battery life decreases at higher volumes and with RGB lighting enabled.
Can you pair two GravaStar Mars Pro speakers together?
Yes. The Mars Pro supports TWS (True Wireless Stereo) pairing between two units. However, Bluetooth latency increases significantly in TWS mode, and using the aux connection disables TWS pairing.
Is the GravaStar Mars Pro waterproof?
No. The Mars Pro is not rated for water resistance. Keep it away from pools, rain, and spills. This is a desk speaker, not a beach speaker.
Does the GravaStar Mars Pro have an app?
No. There’s no companion app and no app-based EQ. You control everything through the touch panel on top of the speaker and your phone’s volume controls.
What colors does the Mars Pro come in?
The Mars Pro is available in Black, White, War-Damaged Yellow, and Special Edition variants including a Shark edition. Prices vary by color and edition. Check current prices on Amazon.
