Product Overview: ‣ Hoco E67 Bluetooth Fm Transmitter 1. Sizes: 74*37*36Mm.Weight: 31G. 2. Bt V5.0, Chip Jl Ac6966. 3. Input: Dc12V-24V. 4. Output: Usb1 – 18W (For Qc / Fcp / Afc). Usb2 – 5V / 1.5A. 5. Support Bt, Usb Flash Drive Playback. 6. Working Principle: The Mobile Phone Connects To The Transmitter Via Bt, The Transmitter Connects To The Car Speaker Via Fm.