Features - Color: Black. - Material: Aluminum alloy. - Size: Approx. 50 x 48 x 52mm. - Support to play MP3 music from your Micro SD/TF or U-disk, plug and play. - 3.5mm audio input: the speaker can also be connected with your 3.5mm-jack audio devices, such as iPhone, iPod, tablet PC, MP3, MP4, etc., to let you enjoy wonderful music. - FM Radio: With built-in radio frequency module and telescopic antenna, it can be used to listen to FM radio. (Support auto search). - FM radio frequency: 87.5~108MHz. - LED display panel to display music playing time, and FM radio channel. - Multi-color LED flashing light at the base of the speaker, very cool. - Function buttons: On/Off, Menu, Previous song, Next song, Play/Pause, Volume control. - Powered by built-in rechargeable lithium battery for durable to use. Specifications - Battery type: built-in 600mAh rechargeable lithium-ion battery. - Input voltage: USB DC 5V. - Playing time: about 2-5 hours after full charge. (The actual playing time depends on the music volume size). - Music format: support MP3 format. - Output power: RMS 3Wx2 THD=10%. - Frequency response: 150-18000Hz ( plusmn;3dB). - Signal and noise ratio: more than or equal to 85dB. - Main interfaces: 1 * Micro SD /TF slot, 1 * USB 2.0 port, 1 * mini USB power port, 1 * 3.5mm audio input, 1 * 3.5mm audio output.