IP5191L Features Track body energy， calories burned， steps taken， distance traveled and sleep quality Compatible with iPhone 5+ and Android 4.3+  One year battery life on a CR2032 coin cell battery 365 days device memory Water proof up to 5 feet Wireless: Bluetooth Smart Technology Transmission Range: approximately up to 5 meters General Specs Battery Style CR2032 coin cell battery  Battery Life 4-6 months， 24 hours per day Wireless Bluetooth Smart， standard BLE profile IOS iPhone 5+ Android 4.3+ Waterproof IPX4 Transmission Range approximately up to 5 meters (16 ft) Operating Temperature Minus 10 - 50 degrees Product Details (without package and accessories) Dimensions 24 x 7.5 mm Weight 5 g Package Details Weight: 25.68 g Size: 6*6*2 cm