Motorcycle Bike Audio Sound System Waterproof Security Alarm FM Radio Stereo Amplifier USB SD Remote MP3 Player With Speakers Support power off memory play and it plays previous music when you turn it on. Support flash drive SD/MMC Card MP3 Music Player. Support FM Radio And the USB TF card. Anti-theft Function with Remote Control. USB interface for phone charging , GPS and more devices Portable audio devices , featuring a slim connector molding that fits easily into a 3.5mm headphone jack