Features: Support  TF card, for SD card, USB, audio input.  Support speaker and headphone output.  Built-in rechargeable lithium battery.  10 buttons to choose MP3 music directly.  FM radio with clear audio channels. You can press the number keys to select the station.  The display, the volume level is clear at a glance.  Power failure memory function, turn on and connect the song before power off.  Easy to use.  Frequency: 87.5-108MHZ;  Working voltage: 4.2V;  Rated impedance: 4Ω;  Power: 3W;  MP3 decoding rang: 8~320k bps;  MP3 S/N: 87dB;  MP3 Dynamic rang: 92dB;  MP3 Channel separation: 69dB;  Frequency response: 20Hz-20KHz;  Distortion: <0.05;  Speaker: 66mm 4Ω 3W;  Power output: 3W max;  Battery: 3.7V 800mAh Li-ion battery;  Size: 125 x 36 x 73.5mm/4.9 x 1.4 x 2.9inch;     Note: Please allow 0.5-1cm differences due to manual measurement.  Due to the light and screen difference, the item's color may be slightly different from the pictures.     Package Included:  1 x Portable Radio(built-in battery);  1 x User Manual;  1 x USB Charging Cable