MP3 
Working voltage: 12V-24V
The limits of working voltage: 9V-26V
USB output 5V-3.1Max
Wireless version: 5.0+EDR
Wireless effective range: 10M
Cell phone microphone Wireless effective rang: 0.5M - 2M
FM frequencies: 87.5MHz -108.0MHZ
FM mode: Stereo sound digital PLL frequency locking (or seeking)