Color: silver, black, green, blue, pink Product Dimensions: 8.5 * 5 * 5.3cm Material: Aluminum Range :87.5-108MHz FM frequency Battery: Built-in polymer battery (lithium battery) 550mAH Output power: RMS 6W (3W +3 W) THD = 10% Frequency response :150-18000Hz (± 3dB) SNR: ≥ 80dB Speaker: 1.77 inches (Foreign Economic 45MM) Magnetically shielded, 4 ohm LINE In Interface: 3.5mm stereo plug with Power Input: Built-in lithium battery, USB power cable, 5.5V/1A AC power converter