FeatureDescriptionModelH21 Ultra 2 Smart WatchCallingBluetooth call supportDisplay2.01-inch large TFT screen, 240 × 296px resolutionSports ModesMultiple sports tracking modesHealth MonitoringHeart rate and fitness monitoring featuresChipsetMaster control chip: ZK8918EncoderBuilt-in encoder for accurate performanceMemory32Mb extended memorySensorTianyi 3301 sensorBattery Capacity230mAhBattery Life3–5 days usageChargingMagnetic charging, 2–3 hours charging timeWaterproofIP65 rated (splash & dust resistant, not for swimming)MaterialZinc alloy + silicone strapUsageDaily wear, fitness, and outdoor activities