Amazfit T-Rex Ultra 2 / Apple Watch Series 6 (40 mm, GPS)

Amazfit T-Rex Ultra 2: A2550 · 51 mm · Black Magma · silicone strap

Apple Watch Series 6 (40 mm, GPS): Apple Watch Series 6, 40 mm aluminium case, GPS (2020). The 44 mm and GPS + Cellular versions, stainless steel/titanium cases and the Nike and Hermès editions are separate.

Specification	Amazfit T-Rex Ultra 2	Apple Watch Series 6 (40 mm, GPS)
Release year	2026	2020
Announcement / availability	19 February 2026 Amazfit	—
Display	1.5-inch AMOLED · 480 × 480 · sapphire glass Amazfit	Always-On Retina LTPO OLED; 324 × 394 pixels, 759 mm² display area; 1000 nits The Always-On display keeps the time and complications visible with the wrist down. Apple
Peak brightness	Up to 3000 nits With auto brightness; unavailable in low-temperature mode or below 30% battery. Amazfit	—
Body	Polymer case; Grade 5 titanium bezel, buttons and back Amazfit	—
Size / weight	51 × 51 × 14.3 mm; 89.2 g with strap Thickness excludes heart-rate sensor base. Amazfit	—
Strap	26 mm silicone; 145–215 mm wrist Amazfit	—
Storage	64 GB total; up to 26.7 GB user space Amazfit	32 GB Apple
Positioning	Dual-band GNSS; six satellite systems Amazfit	—
Sensors	BioTracker 6.0 PPG; barometer, compass, motion and temperature sensors Amazfit	—
Battery	870 mAh; up to 30 typical / 15 heavy / 10 AOD days Separate manufacturer scenarios, not continuous GPS endurance. Amazfit	—
GPS battery modes	Up to 50 Accurate / 90 saving / 177 max-battery hours Amazfit	—
Wireless	Bluetooth 5.2 BLE; 2.4 GHz Wi-Fi Amazfit	Wi‑Fi 802.11b/g/n 2.4 and 5 GHz; Bluetooth 5.0 LTE and UMTS are only on GPS + Cellular models. Apple
Water / diving	10 ATM; recreational diving up to 45 m Not for technical, cave or mixed-gas diving. Amazfit	—
Phone connection	Android 7+ / iOS 15+; Zepp app Amazfit	—
Charging	Magnetic charging puck; USB-C cable separate Amazfit	—
Calls	Bluetooth calls using microphone/speaker Amazfit	—
Case and version	—	40 mm aluminium case, GPS; Silver, Space Gray, Gold, Blue, (PRODUCT)RED Stainless steel and titanium cases were only sold in the GPS + Cellular version. The 44 mm model uses the same chip but has a different display and weight. Apple
Water resistance	—	50 metres (ISO 22810:2010) Suitable for shallow-water swimming in a pool or the sea, but not scuba diving, waterskiing or high-velocity water. Apple
Chip	—	S6 SiP with 64-bit dual-core processor; W3 wireless chip; U1 Ultra Wideband chip Ultra Wideband availability varies by region. Apple
Health sensors	—	Blood oxygen sensor (Blood Oxygen app), electrical heart sensor (ECG app), third-generation optical heart sensor Apple states Blood Oxygen measurements are not for medical use and are only designed for general fitness and wellness. The ECG app is not intended for people under 22. Apple
Other sensors and safety	—	Always-on altimeter, compass, accelerometer up to 32 g with fall detection, gyroscope, ambient light sensor; Emergency SOS On the GPS model, Emergency SOS needs the iPhone nearby; otherwise the watch must be on a known Wi‑Fi network with Wi‑Fi Calling on. International emergency calling is only on the cellular model. Apple
Battery and charging	—	Built-in lithium-ion battery; up to 18 hours; magnetic charging cable (1 m) The 18-hour figure comes from Apple’s August 2020 testing with pre-production watches paired to an iPhone; it varies with use. Apple
Other	—	Speaker, microphone, Apple Pay, GymKit; ceramic and sapphire crystal back Apple
Compatibility	—	Requires an iPhone 6s or later with iOS 14 or later Apple
Size and weight	—	40 × 34 × 10.7 mm; 30.5 g (aluminium, without band) Apple