... and SD card absolute Power Amplifier,and stereo FM radio (87.5—108MHZ)onto multimedia Products ... and SD cards transform each other, AUX input, FM . Lasting press for 3 secondsRemote controller function1, ... /PAUSE,Play/pause function, Auto search function in FM mode. 5, VOL-,Turn down volume 6, ... ,8,9,100+,(reduce frequency in FM mode), 200+( increase frequency in FM mode);numeric key, combined selection: ...