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Tom's Guide
06-07-2025
- Tom's Guide
My favorite Meta Quest 3 accessory just got an audio upgrade — and VR never sounded better
Leave it to Kiwi Design to deliver another valuable upgrade to Meta Quest 3 and Quest 3S headsets, this time bringing immersive audio to VR in a comfortable battery head strap. The company behind the quintessential VR accessory that I won't use my Quest 3 without, the H4 Boost Halo Battery Strap, now has the Kiwi Design K4 Duo. It's an all-in-one audio head strap with battery, and it solves an issue I've had with Meta's headsets: loud audio. Yes, the Quest 3 and 3S offer great 3D spatial audio, but when I'm playing games, watching movies or even listening to tunes while connected to Windows 11 in VR, sound leaks out for all to hear. That's no longer the case when the K4 Duo is strapped on, as its adjustable, cushioned earphones deliver isolated, clear audio — just like what the best gaming headsets do. Throw in the nearly 3-hour battery life to extend VR sessions (like the H4 Boost), 45W dual-port fast charging and comfortable, flexible design, and you've got yourself a head strap that adds premium trimmings to any Quest 3 headset. It's not without some flaws, but it's one of the best Meta Quest 3 accessories you can get to upgrade your VR sessions. Read on to find out why. Kiwi Design H4 Boost Halo Battery Strap Price $159 / £139 Compatibility Meta Quest 3 / Quest 3S Battery 5,300mAh Charging Up to 45W Weight 16.1 ounces Kiwi Design's K4 Duo isn't too different from its H4 Boost Halo head strap, especially when it comes to its core principles like its comfort and extra battery life. That's no bad thing, but this has the addition of fine-tuned audio from its attached earphones. Finding out the K4 Duo comes with its own audio put me in two minds: having a head strap deliver a set of headphones is a smart move, but would it be just a cheap add-on, especially considering they kind of look like the sponge-foam headsets you'd get on a flight? Rest assured, they aren't. As soon as I attached the head strap and plugged in the well-sized USB-C cable to my Meta Quest 3, I could immediately hear the difference in soundscape compared to the VR headset's speakers. Even on the homescreen, where I have the gushing noise of a fountain and birds chirping every once in a while, the audio was finely tuned. Even at full volume, sound didn't leak from the earphones when I took off the headset. That's great news for VR owners who need to game quietly or those who want to be fully absorbed by the best Quest 3 games out there. And that's especially true of all the music-based rhythm games like Beat Saber, Pistol Whip or Smash Drums. Thanks to the switch on the right earphone, I could switch between the earphone audio and the Quest 3's own speakers easily, too. Speaking of, I decided to dive back into Batman: Arkham Shadow, and as I was preying on thugs and grappling between ledges, I could hear the "zip" and "ting" of the clasp attaching to a point and pulling me in. I also heard each "thud" of my fist connecting to foes while beating them up, which was satisfying, indeed. For a more immersive, spooky feel, I put on Metro: Awakening. As with the spatial audio of the Quest 3's speakers, I could clearly hear the disturbing whispers of ghosts crying for help around me, along with chats from enemies in the distance as I slowly crept my way around them. I was also freaked out by the fast pitter-patter of a mutated spider crawling on me (shudder-inducing stuff). It also makes for more isolated listening when watching shows on streaming apps like Netflix or Amazon Prime Video, which was great when watching the final episodes of "Squid Game" season 3. While not quite the all-encompassing cinema-sounding levels, it's still nice to get the big-screen treatment with loud audio with clarity. With the Meta Quest 3S Xbox Edition now out, it also means the head strap can deliver this excellent audio to the latest Xbox Game Pass titles, and that includes AAA games like Doom: The Dark Ages. Now, I wouldn't say it matches the audio quality of the best headsets for gaming around, as there aren't any customizable EQ settings or high-end drivers, but it's fully immersive nevertheless. Overall, for completely inclusive sounds for your VR sessions, the K4 Duo's earphones will do the trick. As with the H4 Boost Halo, the K4 Duo matches its comfort and easy adjustability but takes it a step further with its simple padded top strap, flexible earphones and lightweight feel. That last one is surprising, as the K4 Duo weighs 16.1 ounces compared to the H4 Boost's 15.7-ounce weight. This is more due to the K4 Duo's lack of a front facial headpad, which I noticed felt heavier on the head. It trades it for a silicone-added top strap instead, which I found to be very comfortable on my scalp. The audio head strap is also supremely easy to put on and adjust, thanks to the rear dial that can change the tightness. It's also flexible to adjust the angle when putting it on or taking it off, all so I could easily slip my head into the strap and get into VR. That customizable fit is also easier on the face, so the Quest 3's facial interface isn't squashing to the areas around my eyes that can irritate the skin. Finally, the earphones themselves are also flexible, so they can be folded in and out, swivel to the sides and adjust for length. That makes it a head strap size for all. I've said it before, but the Quest 3 and Quest 3S' 2-hour battery life just isn't long enough for the many VR games and apps that demand more time to use. That's what the H4 Boost solved, and the K4 Duo does exactly the same. Using the same 20.4 Whr / 5,300 mAh battery capacity, my Meta Quest 3 could last nearly 3 hours longer with the head strap plugged in. That's a boon to anyone who wants to play in VR for that much longer, or actually watch a full-length movie without the headset dying on you. It also comes with the same dual-port fast charging, which simultaneously charges the K4 Duo and Quest 3/3S. So, with a 45W charger, both devices get 22.5W each. It takes a little over 2 hours to charge them from 0% to 100%, which is just as long as Meta's VR headsets. Again, you're getting up to 5 hours of battery life in a single charge instead of just a measly 2 hours. The Kiwi Design K4 Duo does a lot right, but you'll be paying more for this VR upgrade over other head straps out there, including the companies own H4 Boost Halo battery strap. That, and its earphones can be a tad irritating during long VR sessions. Priced at $159 / £139, the K4 Duo is Kiwi Design's most expensive head strap to date. It makes sense, considering it comes with earphones, padding and that extra battery capacity, but it's more costly than the H4 Boost ($99 / £79) and BoboVR S3 Pro ($89 /£76). Even the Meta Quest Elite Strap with battery ($129/£129) is more affordable. Again, these don't come with their own headphones, and the thing is, Kiwi Design often offers significant discounts on its head straps. As of writing, the K4 Duo is down to $109/£109, which is far more enticing. That's all to say that if you're looking to grab the K4 Duo, it's best to wait until it drops to its lowest price, especially during big sales events. With its sponge-foam padding on the earphones, the K4 Duo was immediately comfortable on my ears. It doesn't press too firmly on them either, giving my ears a nice cushion while I move around frantically in games like Batman: Arkham Shadow or Pistol Whip. However, I noticed that after a few hours in a VR session, my ears were getting hot and irritated. Not majorly, mind you, but enough for me to fold the earphones out to give my ears a break. That's expected with this kind of material, but I wouldn't say it's a deal-breaker. But it would have been nice to see memory foam cups used instead, similar to the SteelSeries Arctis Nova 3. The Kiwi Design K4 Duo Audio Head Strap with Battery may only apply to a niche group of VR users that want more VR time on their Meta Quest 3 or Quest 3S with personal audio, but it does a fine job of executing its advantages. Not only does it make the Quest 3 supremely more comfortable and secure to wear, but it also extends the Meta Quest 3's battery life to a more suitable time and delivers fantastic audio straight to your ears. For those that already have a head strap and audio solution, such as the Final VR3000 wireless earbuds (£89) or Final VR500 wired earbuds ($35), then the K4 Duo's all-in-one perk won't be worth its price. Let it be known that its otherwise comfy sponge-foam earphone padding can irritate your ears after a long session, but that's only a small nuisance. But for those who want to give their Quest 3 or 3S an upgrade that covers battery, comfort and audio, then make sure the K4 duo is at the top of your list of VR accessories to pick up.
Tom's Guide
25-06-2025
- Tom's Guide
This single VR upgrade makes the Meta Quest 3 better — and it's at its lowest price in early Prime Day deal
We're already seeing some of the best early Prime Day deals in the lead-up to the big event, and thankfully, that also includes my favorite VR accessory that gives my Meta Quest 3 a massive upgrade in comfort and battery life. Anyone who owns a Quest 3 or Quest 3S will know the pain of being thrown out of their VR session when the headset's short, 2-hour battery life goes kaput. And the included headstrap isn't exactly comfortable for those longer gametimes. An upgrade is essential, and Kiwi Design has just the head strap on sale. The Kiwi Design H4 Boost Halo Battery Head Strap is down to its lowest price yet on Amazon, taking it down from $99 on the company's site to $67. For those looking to extend their VR gaming sessions to up to 5 hours in superior comfort on their Quest 3, Quest 3S and even the upcoming Quest 3S Xbox Edition, this is the VR accessory for you. The Kiwi Design H4 Boost Halo Battery Strap is the VR essential the Quest 3 and Quest 3S deserve, and I now can't imagine playing without it. With its silicone pads offering improved, secure comfort and its 5,300 mAh capacity offering nearly 3 hours of additional battery life, it's an easy upgrade to get. Now that it's $30 off compared to its original price, this is a valuable VR accessory to give your headset a much-needed boost. I've spent a lot of time using the Kiwi Design H4 Boost Halo Battery Strap, and it made me realize that Meta's VR headsets require some add-ons to make the most of them. With this head strap, I now use my Quest 3 far more than I usually would have, and that's because it solves two major problems: battery life and comfort during longer sessions. There are many brilliant VR games and apps to use on the Meta Quest 3 and Quest 3S, whether it be pummeling thugs in Batman: Arkham Shadow or learning how to draw in Pencil, and using this battery head strap meant I could do it all for longer. Not only that, but its silicone face pads feel incredibly comfortable for those longer sessions. With the Quest 3S Xbox Edition coming, offering plenty of Xbox Game Pass games to play with its included subscription (and Xbox controller), this head strap will deliver plenty more gameplay potential — all without needing a wired connection to keep it charged. With the head strap, you're getting nearly 3 hours of battery life added to the Quest headsets. That allowed me to delve further into some of the best Quest 3 games (especially Asgard's Wrath 2, which can take well over 60 hours), as getting up to 5 hours doesn't disrupt a VR session — unlike the usual 2 hours. It also offers DualFast Power Charging, which simultaneously charges the H4 Boost and the Quest 3. With a 45W charger, both devices get 22.5W each, and I found that it takes just over two hours to fully charge them. So, double the battery life in the same time it takes to charge the Quest 3 / 3S on its own. That alone makes me want to pick up my Quest 3 far more often, but its adjustability and added comfort also make wearing the headset far more snug. No more irritations on your face from the strap that comes in the box, or having a looser fit for those frantic VR games that require a lot of movement. All that without being tethered to a cable? It's a valuable VR upgrade to have, and now that it's down to $67, the Kiwi Design H4 Boost Battery Strap is a worthwhile investment for any VR user. That's only one of the many early Prime Day deals you can grab right now, so get shopping for plenty more limited-time deals!
