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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-04 · 7 min read · Independent comparison
• Zerone V8s biggest strength: A lightweight in-ear ear-hook earpiece with HD voice, mute, and up to 120 hours of standby — built for one-to-one phone calls.
• Zerone V8s biggest trade-off: It's a phone accessory, not a radio — no push-to-talk, no team channels, and Bluetooth 4.1 rather than a newer standard.
• Retevis RB37 biggest strength: A complete two-radio kit with pre-paired Bluetooth earpieces, 22 channels, VOX hands-free, and a 2000mAh battery rated for 12 hours of use.
• Retevis RB37 biggest trade-off: The earpiece only works with the same Retevis RB37 radios — it will not pair with your phone or any other brand of Bluetooth headset.
• Choose Zerone V8s if you mainly take phone calls and want one earpiece that works with the devices you already own.
• Choose Retevis RB37 if you need several people talking to each other on a job site, at an event, or around a campsite.
The Zerone V8s is a classic Bluetooth ear-hook earpiece. It connects over Bluetooth 4.1 with a stated range of up to 10 meters, which covers the realistic distance between your phone on a desk and your ear on the other side of a home office. It supports HD voice over wideband networks, plus a mute function during calls, so you can jump on a client call and silence your side when you need to.
What stands out in the specs is the endurance. Zerone lists roughly 8–10 hours of talking time and up to 120 hours of standby from the built-in rechargeable lithium battery, recharged with the included USB cable. If you take a lot of calls but not eight hours of them, that standby figure means you can leave it in a drawer for days and still pick it up for a quick call without hunting for a charger. The in-ear, rounded-tip design is meant to fit a wide range of ear shapes, including smaller ears, and the whole thing is built to be light enough for driving, walking, or running.
Who should buy it? Anyone who wants one dependable earpiece for phone calls — a remote worker on video calls all day, a delivery driver, or someone who just wants hands-free calling without holding a phone. In my opinion it's also a reasonable pick if you want an earbud that won't dominate your ear during long work-from-home sessions.
Retevis RB37: Who It's For
The Retevis RB37 is not really a headset at all — it's a two-pack of FRS two-way radios that happen to ship with wireless Bluetooth earpieces. That distinction matters more than anything else in this comparison. The radios are license-free FRS models with 22 channels, a 2000mAh battery rated for 12 hours of continuous use and 120 hours of standby, Type-C charging, a built-in flashlight, and VOX hands-free operation.
The Bluetooth earpiece side is where buyers get surprised. Retevis states plainly that the RB37 radio can only be used with the same Retevis RB37 headset — it will not pair with other brands of Bluetooth headsets or with your phone's headset. Out of the box the radio and earpiece are already paired, and the earpiece reconnects automatically to the radio it was first linked with. That's genuinely convenient for a team that just wants to switch on and talk, but it means you can't repurpose the earpiece for your phone later.
There's a useful detail buried in the specs: the RB37 can talk directly with other Retevis 16-channel FRS radios on channels 1–5, including models like the RT21, RT22, RT68, and H-777 — as long as channels, frequencies, and sub-audio codes match. If Bluetooth is on, you need the earpiece to hear incoming voice; if you'd rather use the radio's own speaker, you can long-press the side button to turn Bluetooth off. The rated maximum talking range is up to 2 miles, and the units are not water resistant, so keep them out of the rain.
Who should buy it? Small teams who need to stay in contact without phones — event staff, church volunteers, warehouse crews, security, or a family splitting up at a campsite. The two-pack plus pre-paired earpieces is the whole point.
Who should skip it? Anyone who wants a headset for their phone. If your goal is taking Zoom or phone calls at home, the RB37 does not do that job — its Bluetooth is locked to its own radios.
• Best for phone and video calls → Zerone V8s. It pairs with your phone, laptop, or tablet over standard Bluetooth.
• Best for team communication → Retevis RB37. Two radios, 22 channels, and push-to-talk over the air.
• Best for standby endurance → Zerone V8s. Up to 120 hours of standby in a single tiny earpiece.
• Best for all-day shift use → Retevis RB37. A 2000mAh battery rated for 12 hours of continuous operation.
• Best for hands-free convenience → Zerone V8s. No button to hold, just answer and talk.
• Best for hands-free in the field → Retevis RB37. VOX lets you transmit without pressing PTT.
• Best for charging convenience → Retevis RB37. Type-C charging is the modern standard; the Zerone uses USB.
• Best for a mixed-device setup → Zerone V8s. The RB37 earpiece only works with its own radios.
If you're setting up a work-from-home desk and want a clip-on or in-ear option for clear calls, the Zerone V8s fits that role. If you're equipping a group that needs to talk to each other — not to the internet — the RB37 is the only one of the two that can do it.
For most people searching for a business Bluetooth headset for work from home, I'd buy the Zerone V8s. It does the one job you actually need — clear two-way phone audio on the devices you already own — with a 120-hour standby that makes it easy to live with. I'd only steer you to the Retevis RB37 if your real need is a radio system for a team, because as a personal headset it simply can't connect to your phone. Check the current price on Amazon for both before you decide, since that's the one variable I can't weigh for you.
For a Bluetooth model like the Zerone V8s, charge it with the included USB cable, power it on, and pair it with your phone or computer over Bluetooth 4.1. For the Retevis RB37, charge the radio with the Type-C cable, power it on, and use the earpiece that's already paired to it out of the box.
The Zerone V8s pairs like any standard Bluetooth earpiece — put it in pairing mode and select it on your device. The Retevis RB37 arrives pre-paired, and the earpiece reconnects automatically to the radio it was first linked with; if you're unsure which headset belongs to which radio, the manual explains how to clear and reconnect.
Not directly. Bluetooth earpieces like the Zerone V8s connect to a host device, not to one another. The Retevis RB37 gets around this by using its radios as the link — the earpieces communicate through the FRS radio network, not peer-to-peer Bluetooth.
No. Retevis states the RB37 Bluetooth radio only works with the same Retevis RB37 headset and cannot pair with other brands of Bluetooth headsets or mobile phone headsets. If you need an earpiece for your phone, the Zerone V8s is the one that fits that job.
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