Powerful connection range can be up to 5 meters in open area.Bluetooth V4.0 technology, compatible with most Bluetooth-enabled devices including iPhone 6S Plus, 6S, 6, 6 Plus, Samsung Galaxy S6 Edge, S6, etc.Built-in microphone for hands-free phone calls.With a rechargeable lithium battery which offers 4 hours of continuous playback.Supports song switch, volume control via your Bluetooth device.Specifications:Appearance: 52mm * 52mm * 25mmColor: GoldBluetooth version: 4.0Effective distance: 5 meters in open areaRated power: 2 WSignal to noise ratio: 53 dBRated impedance: 4ÎDistortion: THD Battery type: Built-in rechargeable lithium battery (not replaced)Battery life: 4 hours (60dBA / 1m, powder noise)Packing Includes:1x Xiaomi Bluetooth Speaker1x User Manual (Excluding USB charging wire)