Specification: Bracelet size: 40*37*12mm Weight: 34g Color: silver black; black; silver blue; silver blue; silver pink Chip: 8762C Compatible system: support Android4.4 (inclusive) or higher/IOS9.0 (inclusive) or higher FLASH memory: RAM 32K ROM: 512KB FLASH: 64Mbit Type: TFT Screen size: 1.28 inches Pixel: 240*240 IPS Touch type: full screen touch BT: BT4.0 G-Sensor: support Battery type: lithium polymer Capacity: 200mAh Charging method: USB dedicated charging cable Waterproof grade: IP67 Charging time: 2H Wristband size total length: 220MM adjustable length:145-190MM Material: Watch :Zinc Alloy + Spherical Tempered Glass Wristband: Silicone Package Included: 1 *Smart watch 1 *Charging cable 1 *User Manual 1 *Retail box Note: *Do not take the rear cover apart by yourself. (The rear cover requires professional equipment to disassemble and install.) *This smart watch is not used as a medical device. The measurement data and results are for reference only not as a basis for diagnosis or treatment.