Features and functions 1. Portable Hand FM Radio 2. Portable Mini USB/Card Speakers 3. Play MP3 format music from TF/SD card, U disk. 4 .Connect 3.5mm stereo audio cable to speaker socket"LINE IN",can enjoy the music from mobile phone,MP3,MP4,PC,IPOD and other audio devices Technical Parameters Output power: 3W*1 Frequency response: 100HZ---20KHZ Speaker: 1.55''*1, 4Ω Disortion: ≤1% battery: 400mAh S/N ratio: ≥85db Accessories 1. USB power supply cable 2. 3.5mm-3.5mm stereo connect cable