CP0276S Features Supports TF/ Micro SD card， FM radio and USB flash drive Solid aluminum construction Comes with a LED indicator Features a USB port， DC power port， 3.5 mm audio port， TF card slot Compact size with a wrist strap for ease of carrying Easy to operate General Specs Brand & Model WS-A8   Material Aluminum alloy Output Power RMS 3W  S/N Ratio ≥87dB Frequency Range 150-20000Hz Decoder 8-320KBPS Output Jack 3.5 mm audio jack Other Output USB 2.0 Card Reader Supports TF/ Micro SD card U-disk Supported Yes Battery BL-5C lithium battery Working Time Up to 3 hours Input DC 5V Additional Function Built-in FM radio， frequency: 87.5-108MHz Compatibility Cell phones， MP3/ MP4 players， PCs etc. Dimensions 75 x 70 mm