fm wireless bluetooth kit transmitter adapter mp3 player hands-car modulator support u disk tf card dual charger

bluetooth version:v4.2 limit voltage: 9-29v rated working voltage:12v-24v sensitivity:-42db+ / 3 db 360 working current:45ma(max) stand by current:25ma(max) frequency:2.402-2.480 ghz bluetooth effective range: 10 meters sensitivity:-92 dbm rf output:4 dbm fm frequency:87.5mhz-108.0mhz transmitted power: 87dbuv / 107dbuv microphone effective range: 2 meters 1.this equipment can detect battery`s voltage. 3.support mobile`s a2dp function. music will be played directly while the mobile phone is connected. 4.mobile phone can be connected automatically when the device powered on.