CP0279S Features Supports TF/ Micro SD card， USB flash drive and FM radio Features a USB port， DC power port， 3.5 mm audio port， TF card slot Compact size and lightweight General Specs Brand & Model T-2020   Speaker Size 45 mm 4ohms Speaker Power RMS 6W THD=10% S/N Ratio ≥70dB Frequency Range 150-18000Hz 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 5V 1000mA Additional Function Built-in FM radio - frequency: 87-108MHz Compatibility Cell phones， MP3/ MP4 players， PCs etc. Dimensions 70 x 80 mm