Features: 1. Hand-free function 2. Allows you answer the call and listen to stereo music anytime and anywhere. 3. Bluetooth wireless, apply to mobile phone,MID,PC,etc 4. Waterproof can be used in the bathroom 5. Unique sucker design, easy for carrying and be a good companion with you anywhere,you can put it on the smooth wall, car, glass and mobile phones/blackboard/PC so on or use it as a stand The special anti water drop design can be used in the bathroom. 6. Support volume adjusting and song switching. 7. Suitable for all bluetooth enabled devices. Specification: 2-inch Hi-Fi full-rangs speaker Built-in Microphone Bluetooth V3.0, A2DP,HFP,HSP,CSR solution, Loudspeaker output : 3W RMS hands-free phone call Operation range:up to 15 meters, Function Key:Volume +/-, Dial up/Hang up Volume adjusting: long press the + & - key Song switching: shortly press the + & - key Frequency response: 100Hz to 20kHz Signal-to-noise: 75dB Distortion: 1.0% Built - in rechargeable Li-ion battery: 400mAh Charging time: 2.5 hours Playback time: 40 mins Material: Silicon cover &ABS Plastic Output:3W Input:DC 5V Power supply: USB port Color: Black, White, Blue, Pink, Green, Orange Package: 1X Bluetooth Speaker 1X USB Cable Note:This speaker can work continuously for about 40 minutes on a full charge.