Features - Color: Black. - Material: Aluminum alloy. - Size: Approx. 50 x 48 x 52mm. - Supports playback of MP3 music from Micro SD/TF card or USB drive, plug and play. - 3.5mm audio input: the speaker can be connected to 3.5mm-jack audio devices such as iPhone, iPod, tablet PC, MP3, MP4, etc., allowing you to enjoy high-quality music. - FM Radio: Built-in radio frequency module with telescopic antenna for FM radio reception. Supports auto search. - FM radio frequency range: 87.5–108MHz. - LED display panel shows music playback time and FM radio channel. - Multi-color LED flashing light at the base of the speaker. - Control buttons: On/Off, Menu, Previous track, Next track, Play/Pause, Volume control. - Powered by built-in rechargeable lithium battery for extended use. Specifications - Battery type: Built-in 600mAh rechargeable lithium-ion battery. - Input voltage: USB DC 5V. - Playback time: Approximately 2–5 hours on a full charge (actual playback time varies based on volume level). - Music format supported: MP3. - Output power: RMS 3Wx2, THD=10%. - Frequency response: 150–18000Hz (±3dB). - Signal-to-noise ratio: ≥85dB. - Main interfaces: 1 x Micro SD/TF card slot, 1 x USB 2.0 port, 1 x mini USB power port, 1 x 3.5mm audio input, 1 x 3.5mm audio output.