Model: PG666; Compatible system: compatible for IOS / Android system; Functions: 6 sets of themes, custom dial, step counting, brightness adjustment, multi-sport mode, sleep detection, heart rate, blood pressure, blood oxygen, breathing training, information push, remote music, remote camera, real-time weather, find mobile phone ( connected to a mobile phone), alarm clock, stopwatch, do not disturb mode, female menstrual cycle, timer, Bluetooth-compatible call; App supports languages: Simplified, English, Traditional, Greek, French, German, Italian, Spanish, Dutch, Portuguese, Russian, Turkish, Japanese, Polish, Romanian, Thai, Vietnamese, Indonesian, Korean, Arabic; Languages supported on the device side: Simplified, English, Traditional, Greek, French, German, Italian, Spanish, Dutch, Portuguese, Russian, Turkish, Japanese, Polish, Romanian, Thai, Vietnamese, Indonesian , Languages supported by the manual: Chinese, English; app: PGfit; Chip: Realtek 8763EWE; Button type: 2 physical buttons; Compatible for andiord system: Compatible for Android 5.0 and above; Compatible for ios system: Compatible for IOS 10.0 or above; Bluetooth-compatible: Bluetooth-compatible 5.1; Heart rate: LC11S; Product process: aluminum alloy + ABS; Body net weight: 45 grams; Screen size: 1.39-inch TFT high-definition round screen; Screen resolution: 360 x 360; Screen type: IPS full viewing angle color screen; Screen material: glass; Total length of wrist strap: 270mm; Wristband Material: Silicone; Machine head size: 50.4 x 54.3 x 13.2; Battery type: lithium battery; Battery model: 602226 polymer; Battery voltage: 3.7V; Battery capacity: 340mAh; Battery life: 5-7 days for normal connection and 20-30 days for standby. (connection depends on personal usage); Charging method: magnetic charging; Charging time: about 3 hours;.