2012 hot sale!bluetooth headset for iphone: 1.Support systems: audio equipments with bluetooth functions, such as pc, cellphone, mp3. 2.Bluetooth protocol standards: bluetooth v2.1+edr 3.Receiver range: 10m/360 degree, 4.Carrier frequency: 2402mhz-2480mhz 5.Usb interference: high speed USB2.0 6.Battery: chargeable lithium-ion polymer battery(3.7v/320ma/h) 7.Charger power: computer usb interface dc5v,dc5v(500ma),travel charger,dc5v(500ma)car charger 8.Successive working time: about 10 hours 9.Frequency response: 20hz-20khz 10.S/n ratio: -82db Speaker parameter: 1.Speaker diameter: 40mm 2.Impedance:32 3.S.P.L.:106db s.P.L.At 1khz 4.Rated power:20mw 5.Aggregate capability:40mw 6.Frequency response:20hz-20, 000hz. Blister packing and papercard.