FOUR Mobile 4-FMTBT2.1 FM Transmitter

Bluetooth version: ATS 5.0 Bluetooth protocol: AVRPCP, HFP, A2DP Frequency Range: 87.5 - 108.0MHZ Bass Boost function Micro SD Card ( max capacity ): 64Gb Music Format: MP3, WMA, APE, FLAC, WAV Supports Line in/out function Bluetooth distance: 7m Size of screen: 22.5 x 14 x 4mm Cable length: 80cm Output power of the included usb charger is 2.1A in total.