ID115 Smart Bracelet Fitness Tracker Step Counter Activity Monitor Band Alarm Bluetooth Wristband for iOS Android -Green Compatibility: Android/iOS OS Compatibility: Android 4.4 / iOS 7.1 and above system Screen Size: 0.86 inch OLED screen multi-point touch screen switch mode Bluetooth: Bluetooth 4.0 Battery Type: 50mAh Li-Poly battery Operating Time: 5~7 days Width: 240 x 16 x 10 mm Weight: 18 g