2 Colors for your choice: Black/PinkBand Material: ABS Plastic + TPU + ALBody Dimensions: 50X15.8X 8mmL x W x HStandby time: 36 HoursApplication system: Andriod 4.3 or later/IOS 7.0 or later!! You must install the APP?��Care724?�� first， then you can connect with bluetooth.How to use it ， how to Pairing and Sync Date: Go to App store or play store， download this APPScreen 0.49' OLED Display Battery 40mA Li-polymer Three-proof Grade IP67 Standby time 4 days Blutooth class BT4.0 Charging method Standard USB