Wirelessly Transmits Audio to FM via Bluetooth Automatic Priority Mode Switching for Calls Built-in Microphone Dual USB Outputs: 5 V / 1 A & Q.C 3.0 Supports USB / Micro SD Card Voltage Detection SPECIFICATIONS: Bluetooth® Version: v5.0 Protocol: AVRCP, HFP, A2DP Frequency Range: 87.5 – 108.0 MHz Frequency Stability: ± 10 ppm Product Input: 12 – 24 V Music Format: MP3, WMA Micro SD (Max Size): 32 GB USB Disk (Max Size): 32 GB Total Output: 5 V / 1 A + QC 3.0 Material: ABS