Support Bluetooth calls APP: SZOS; compatible system: Android 4.4 and above and IOS8.0 and above FLASH memory: RAM(192KB) Screen size: 1.85 inch full fit; Pixel: HD 240*280 Touch type: full touch screen Battery: capacity 190mAh polymer battery; charging time: 150 minutes to fully charge charging method: wireless charging Material: silicone strap Answer calls, receive text messages, listen to music You can check the sleep details and sleep history records of the day on the APP sleep interface This product supports IP68 waterproof, supports rain, wash hands Get early warning notifications when your heart rate is too high or too low Record the amount of exercise every day, and accurately follow up common physical training