Joinwin&reg; Waterproof Mini Mushroom Wireless Bluetooth Speaker-Great Sound, Water Resistant with Built-in Microphone (Green) Bluetooth wireless connectivity: Pairs with any Bluetooth device Incredible sound quality in a small space saving speaker that fits in your hand Bluetooth:Bluetooth 3.0, A2DP,HFP,HSP,CSR solution, high quality sound Function Key:Volume +/-, Dial up/Hang up;Built-in Battery: 300mAH, Li-ion batter