Modulator FM Akai BT FMT-74BT BLUETOOTH HANDSFREE CAR KIT FM TRANSMITTER AKAI FMT-74BT Wireless transmits phone call & audio playing to the car FM stereo system via Bluetooth Switch Hands-free model automatically from music playing status when receiving phone call. Detects the voltage of Car Battery when power on Supports reading TF card and USB disk (maximum 32 GB) With line-in/out function Supports USB charger 5V/1A+QC3.0 Bluetooth Version: 5.0 Bluetooth protocol: AVRCP, HFP, A2DP Frequen