Technology: bluetooth 4.0 Radio frequency: 2.402-2.480GHz Audio output: 35mW, <15mA Transmission range: <10 m Charging Power: input AC 110-240V; output DC 5V Charging time: 2 hours Talk time: 4 hours Music play: 3 hours Standby time: 120 hours Wearing styles: In-Ear mini headphones Battery: 50mA rechargeable lithium battery Size: 30mm * 18mm * 15mm Weight: about 8.5g Feature: 100% brand new and high quality. Quantity: 1 Taiwan and the bluetooth master control chip. Can talk, listening to music Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music. 2 in a row, to the telegraph, voice prompt operation. Small and light, stealth design.