CP0280B Features Supports TF/ Micro SD card， FM radio and USB flash drive Solid aluminum construction Superb sound effect Comes with LED light Features a USB port， DC power port， 3.5 mm audio port， TF card slot Compact size for ease of carrying General Specs Brand & Model Z-12    Material Aluminum alloy Speaker Power RMS 2.5W THD=10% Impedance 4 ohm S/N Ratio ≥90dB Sensitivity ≥80dB Frequency Range 150-20000Hz Output Jack 3.5 mm audio jack Other Output USB 2.0 Card Reader Supports TF/ Micro SD card U-disk Supported Yes Battery Built-in lithium battery Input DC 5V Additional Function Built-in FM radio - frequency: 87-108MHz Compatibility Cell phones， MP3/ MP4 players， PCs etc. Dimensions 50 x 50 x 50 mm