Drive Unit: 10mm S/N: 95dB Best work range: ≤5m Frequency Response: 20-10KHz Working Frequency: 2402 MHZ~2480MHZ Charging Time: 2H Talk Time: About 7H(70% VOLUME) Standby Time: About 250H Ultra long standby time about 250H, large capacity 110mAh liium battery, 2 hours fast charging Fingertip touch, careful design, covenient operation, easy to complete music, power on, off, phone calls and other functions. Strong compatibility support connect 2 mobile phones. More and more covenient. This product is not only compact in terms of design, it scores high on the aspect of utility too. This is what makes it worth the buy.