FOUR Bluetooth in-car handsfree / transmitter 17.29 EUR Available BUY Article Number: 4-BTHFR1 Share Information Reviews Bluetooth version: 5.1 Bluetooth protocol: AVRCP, HFP, A2DP Product input: 5V Product size: 51.2 x 30.6 x 15.4mm Cable length: 1m Weight: 35.6g Material: ABS.