| Specification | Supports USB / SD card (MP3 format); Supports external audio input; FM 87.5~108MHz; Supports wireless microphone input; Supports memorize playing song and voice volume when power down; Working voltage: 7.4V; Li-ion battery; Input: 9V / 1A; Button: VOLUME: Control sound volume when playing USB / SD card / FM; MIC ECHO: Control reverbration volume during microphone input; MIC VOL: sound volume switch of microphone / guitar; GUITAR IN: Guitar input; LOW BATTERY CHC: battery volume indicator: red: 8V; MIC IN: Microphone input; MODE: AUX / FM / USB / SD card shift in order; LED: Red light flashing when playing or FM searching; Constant light when USB / SD card pause playing or in AUX mode |