We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-26 · 6 min read · Independent comparison
If you want a dedicated, featherweight pair of true wireless earbuds you can forget you're wearing, choose Bloody M70; if you need one rugged gadget that puts earbuds and a full smartwatch on your wrist, choose Tuanzi GT55.
• Bloody M70's biggest strength: it's a purpose-built, lightweight earbud set with 6mm hybrid diaphragm drivers, a claimed 22H total playtime, low-latency Bluetooth 5.0 and IPX4 splash resistance.
• Bloody M70's biggest trade-off: single-charge battery is only about 4 hours, so you're tethered to the case for top-ups, and its "noise control" is sound isolation only — no active noise cancelling.
• Tuanzi GT55's biggest strength: it's two devices in one — a 2.01-inch HD smartwatch with health/fitness tracking plus a built-in TWS headset that charges inside the watch body.
• Tuanzi GT55's biggest trade-off: it's a bulky 160g watch-first product, not a dedicated audio device, and the headset delivers roughly 5 hours per charge with phone calls and app features tied to the Da Fit app.
• Buy the Bloody M70 if you mainly want music and calls in a tiny, pocketable form.
• Buy the Tuanzi GT55 if you want a rugged watch that also happens to carry earbuds for hands-free calls.
The Bloody M70 is a straightforward, single-purpose TWS earbud. Bloody built it around Bluetooth 5.0 with a rated 10-meter transmission range, one-step pairing (you just pick "Bloody M70" on your phone), and a 6mm M.O.C.I. hybrid diaphragm driver with a 20Hz–20kHz frequency range and 32-ohm impedance. In plain terms: these are lightweight in-ear buds aimed at everyday listening, not audio-gear obsession.
The battery story is the one you need to plan around. Bloody rates each earbud at about 4 hours of playback and roughly 1.5 hours to charge, with a 22H total figure that only makes sense with the charging case topping you up between sessions. So if you want a set for a commute, a workout or a couple of hours at a desk, that's fine — but a full workday on a single charge isn't the design goal here. The IPX4 rating means it shrugs off sweat and light splashes, not swimming or a downpour.
Who should buy it: someone who wants a small, easy, wireless pair they can slip in a pocket, pair in seconds, and use for music, podcasts and casual calls. Controls are touch-based media control, and the package includes the buds, charging case, cable, three sleeve sizes (S/M/L) and a manual, so fit adjustment is covered out of the box. Who should skip it: anyone who needs active noise cancelling, marathon single-charge battery life, or a wired jack — there's no headphone jack, it's wireless only. And if you want a watch on your wrist as well, this won't do that job.
The Tuanzi GT55 flips the whole idea on its head: instead of a case, the earbuds live inside the watch. It's a rugged, "military" styled smartwatch with a 2.01-inch full-touch HD display, 128MB of memory, a 345mAh battery, all-metal CNC styling and a silicone band. The built-in TWS headset is designed to be waterproof, sweatproof and dustproof, and it slots magnetically into the watch body to charge and to avoid getting lost. Tuanzi rates the headset at about 5 hours of single playback, made from graphite material.
Beyond audio, this is a fitness and health companion. It tracks real-time heart rate, blood oxygen and sleep, and supports multiple sports modes including mountaineering, skiing, cycling, running and basketball. It also covers the usual smartwatch conveniences: Bluetooth calls, music control, camera control, weather, stopwatch, alarm, calculator, voice control, sedentary and drink-water reminders, customizable watch faces and NFC. It pairs with iOS 9.0 and Android 4.4 or higher through the Da Fit app, which compiles your health summaries and activity data.
Who should buy it: someone who wants one durable device that handles calls, notifications and workout tracking, and who likes the idea of earbuds that never get left on a nightstand because they're clipped into the watch. It's pitched as a gift for a father, husband or active friend. Who should skip it: anyone who wants the lightest possible earbuds, or who mainly cares about music quality in a tiny form. It weighs 160g, it's a watch first, and — importantly — Tuanzi states its health data is for exercise reference only and not for medical purposes, so it isn't a medical device. It also depends on the Da Fit app to work properly.
Side-by-Side: Which Should You Choose?
• Best for battery flexibility → Tuanzi GT55. The 345mAh watch battery plus earbuds that charge inside the watch body means fewer separate charging sessions than a 4-hour-per-charge bud.
• Best for workouts and outdoor sports → Tuanzi GT55. Multi-sport modes, heart-rate and blood-oxygen tracking, and a rugged sweatproof build fit activity better than a plain earbud set.
• Best for a featherweight daily carry → Bloody M70. It's a lightweight in-ear pair that pairs in one step and disappears in a pocket; the GT55 is a 160g wrist device.
• Best for hands-free calling without a phone in hand → Tuanzi GT55. Bluetooth call answering and rejecting happen right on the watch, with the headset switching in seamlessly.
• Best for health and sleep tracking → Tuanzi GT55. Sleep, heart rate and blood oxygen monitoring are simply not part of the Bloody M70's feature set.
• Best for simplicity and low fuss → Bloody M70. No app required, no account, no health data caveats — just pair and listen.
• Best all-in-one gift → Tuanzi GT55. One box covers a watch, a fitness tracker and earbuds, which is why it's marketed toward family gifting.
In my opinion, the right pick comes down to one question: do you want earbuds, or do you want a wearable? If audio is your priority and you want something tiny, light and effortless, I'd buy the Bloody M70 — it does one job cleanly with hybrid drivers, low-latency Bluetooth and IPX4 protection. If you'd rather carry one rugged device that tracks your workouts and keeps earbuds charged and safe on your wrist, I'd buy the Tuanzi GT55. I lean GT55 for anyone with an active, outdoorsy routine, and M70 for everyone who just wants to hit play. Whichever way you go, check the current price on Amazon before deciding, since the two sit in very different product categories.
TWS stands for "true wireless stereo" — two earbuds with no cable between them, each connecting to your phone over Bluetooth. The Bloody M70 is a classic TWS set, while the Tuanzi GT55 hides a TWS headset inside a smartwatch.
Because there's no wire, each bud runs on its own small battery. The Bloody M70 is rated around 4 hours per charge with a 22H total using the case, and the Tuanzi GT55's headset is rated about 5 hours per single playback, recharging inside the watch.
There's no single number — true wireless earbuds range from budget sets to premium models, and this pair sits in very different categories since one is earbuds-only and the other includes a smartwatch. Check the current price on Amazon for each before you buy.
The Bloody M70 uses one-step pairing: turn it on and select "Bloody M70" in your phone's Bluetooth list, with a rated range up to 10 meters. The Tuanzi GT55 pairs over Bluetooth through the Da Fit app, which is required for its watch and earbud functions.
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