Koolertron Jack Rapoo H3010 3.5mm Wireless Headphones For PC Tablet MP3 Ebook ipad ipad 2 Xoom P1000 Frequency response: 20Hz ~ 20kHz;SNR: 85dB Continuous working time: 6 hours;Charging time: 3 hours Speaker Size: 30mm;Transmitter Specification Working voltage: 3.7V;Operating Current: 50mA Input Interface:3.5mm Jack