Product features: Driver unit: , 40mm x 2 Impedance: 32 Sensitivity: 98 4db s.P.L at 1khz Response (system): 20hz~20khz Rated power: 20mw Power supply: lithium battery/dc 5v Built-in 400mah rechargeable battery Plug type: micro usb Unique selling point: Bluetooth version: v3.0 Anc optional: significant noise reduction at 16db Support: hsp, hfp, a2dp, avrcp profiles Bt transmission distance: 10-15m Built-in microphone for calling function Soft headband & ear pad to bring comfortable wearing Unique & fashionable design Clear & powerful sound Support aux in function
