... S60 smartphone operating system compatible. Receiver sensitivity:-75bm (standard) up to 4bm, low radiation Modulation: 2.4G Direct Sequence Frequency ... speaker, bluetooth mouse, Bluetooth dongles,Pager, pager system, 3G wireless modemcell phones, Bluetooth keyboard for ipad and iphone 4, etc ... Tangkeng Village,Shiyan Street,Bao'an District,Shenzhen,China518108 wireless bluetooth numeric keypad