We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
If you want a pair of earbuds that doubles as a piece of jewelry — metal build, RGB light, a lid that pops open just for the fun of it — choose GravaStar Sirius Plus True; if you need maximum battery life, hi-res codec support, and waterproofing that survives real sweat, choose TOZO NC20.
• GravaStar Sirius Plus True — biggest strength: A premium aluminium alloy body with RGB ambient lighting and playful hardware touches (one-touch pop-up lid, bottle opener) that make it a genuine fashion-tech accessory, not just a listening tool.
• GravaStar Sirius Plus True — biggest trade-off: IPX4 only, so sweat and light rain are fine but heavy downpours or full submersion are not; and its 28-hour total figure reflects standard Bluetooth audio, not hi-res.
• TOZO NC20 — biggest strength: A huge 80-hour total playback figure (ANC off) plus LDAC Hi-Res decoding and IPX8 waterproofing — a spec sheet built for travel, long workdays and hard workouts.
• TOZO NC20 — biggest trade-off: ANC and LDAC both drain power, dropping the runtime to 12.5 hours with ANC on; and the ABS/PC plastic build reads practical rather than premium.
• Pick GravaStar if you want your earbuds to look and feel like an object you enjoy owning.
• Pick TOZO if you want the longest runtime, the higher-resolution codec, and the tougher water rating.
The Sirius Plus True is the earbud for someone who cares what their gear looks like on a desk. The housing is high-grade aluminium alloy — metal, not plastic — with a minimalist finish that GravaStar describes as upscale in the hand, and the charging case is metal too. On top of that sits a streamlined six-color gradient RGB ambient light, a one-touch pop-up lid that works as a fidget toy, and a bottle opener worked into the design. Whether you find that charming or gimmicky is a matter of taste, but it is unmistakably a deliberate design position: this is an accessory first and a tool second.
On the audio side it runs 10mm composite dynamic drivers with a 20 Hz–20,000 Hz frequency range and 16 ohm impedance, paired with Bluetooth 5.3 for stable, low-latency transmission — a sensible combination for music, video and gaming. Noise cancellation is hybrid dual-feed ANC, and there's separate ENC call noise reduction to isolate your voice on calls in loud places. A companion app lets you adjust EQ and remap the controls, which matters more here than on most earbuds because there's no audio jack at all — wireless is the only option.
Where it gives ground is endurance and water. You get 7 hours in the buds plus 21 from the case for a 28-hour total, with a 1.5-hour charge time, and IPX4 means sweat and light rain are covered but not swimming or a soaking. Buy it if you want distinctive metal-and-light design, app-tunable sound, and you're a commuter, office worker or light gym-goer. Skip it if you need multi-day battery, the highest-resolution codec, or genuinely waterproof earbuds.
The NC20 is the opposite philosophy: every spec points at endurance and durability. TOZO rates it at up to 80 hours of total playback with ANC off, and even with ANC running you're looking at 12.5 hours in the buds and 63 hours with the case. A built-in LED power display on the case tells you where you stand instead of making you guess. If you've ever had earbuds die mid-flight or mid-shift, that combination is the whole argument for this pair.
The acoustic package is a custom 12mm driver with a Super DLC diaphragm and dual magnets, aimed at clear highs and distortion-free bass. More importantly for picky listeners, it supports LDAC Hi-Res audio wireless decoding — a codec that carries far more data than standard Bluetooth streaming. Adaptive Hybrid ANC targets low-frequency noise like traffic and engine rumble, and six microphones with AI call processing handle voice pickup. Bluetooth 6.0 adds dual-device pairing, so you can hold a laptop call and a phone call without re-pairing. In-ear detection (enabled through the TOZO app) pauses audio when you remove a bud.
Durability is where it separates hardest: IPX8 with a sealed acoustic chamber, nano waterproof membrane and nano coating. That's a rating designed for sweat, rain and heavy daily exposure, not just splashes. Each bud weighs about 3.7g, and the case supports wireless charging. The app offers 32 EQ presets plus user-shared profiles. Buy it if you travel, work long days, train hard, or want one pair to cover calls, music and workouts. Skip it if you specifically want a metal-bodied, design-forward accessory — the ABS/PC shell here is functional, not flashy.
• Best for battery life → TOZO NC20. 80 hours total (ANC off) versus 28 hours on the GravaStar. That's not a close call.
• Best for design and materials → GravaStar Sirius Plus True. Aluminium alloy housing and case, RGB ambient light, pop-up lid, bottle opener. Nothing in the TOZO spec sheet competes on looks.
• Best for water and sweat resistance → TOZO NC20. IPX8 with a sealed chamber and nano coating beats IPX4 decisively for workouts and weather.
• Best for hi-res audio codec support → TOZO NC20. LDAC decoding is the headline feature here; GravaStar lists Bluetooth 5.3 and a 10mm dynamic driver but no hi-res codec.
• Best for commuting and office focus → either, with a lean to TOZO. Both offer ANC, but TOZO's adaptive hybrid system is explicitly tuned for low-frequency traffic and ambient noise, and dual-device pairing is genuinely useful if you juggle a phone and laptop.
• Best for calls in noisy places → GravaStar Sirius Plus True (on paper). It pairs hybrid ANC with dedicated ENC call noise reduction. TOZO counters with six mics and AI processing — a different route to the same goal, and the honest answer is that both take calls seriously.
• Best for app customization → TOZO NC20. 32 EQ presets plus community profiles is a deeper toolkit than GravaStar's EQ and key remapping, though both apps do the essentials.
• Best for a light, forget-you're-wearing-them fit → TOZO NC20. At roughly 3.7g per bud with soft silicone tips, it's built for all-day wear.
My Verdict
If I were spending my own money on one pair for everyday life, I'd take the TOZO NC20. In my opinion, the 80-hour total runtime, LDAC support, IPX8 waterproofing and dual-device pairing cover more real situations — long travel days, sweaty workouts, back-to-back calls — than any single feature on the GravaStar. That said, the GravaStar Sirius Plus True is the one I'd buy if I already owned capable earbuds and wanted something with actual personality: metal in the hand, RGB light, a lid I'd fidget with constantly. Two different jobs, two different winners.
TOZO NC20 by a wide margin. TOZO rates it at up to 80 hours total with ANC off and 12.5 hours in the buds with ANC on, while GravaStar lists 7 hours in the buds plus 21 in the case for 28 hours total.
TOZO NC20. Its IPX8 rating with a sealed acoustic chamber and nano coating is built for sweat and heavy exposure, whereas GravaStar's IPX4 covers sweat and light rain but not much more.
They're aimed at different priorities. TOZO NC20 wins on paper for resolution thanks to LDAC Hi-Res decoding and a 12mm Super DLC driver; GravaStar Sirius Plus True counters with 10mm composite drivers and app-based EQ tuning. If hi-res streaming matters to you, TOZO is the pick — otherwise let design and fit decide.
If you want the longest runtime and the toughest water resistance, go TOZO NC20; if you want a metal, design-forward accessory, go GravaStar Sirius Plus True. For pricing, use the button on this page to check the latest price on Amazon for whichever model you're leaning toward.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.