Material: aluminum alloy <br>Product size: 5*5*5 cm <br>Battery: Built-in polymer battery (lithium battery) 300mAH <br>Output power: RMS 3W mono THD=10% <br>Frequency response: 150-18000Hz (±3dB) <br>Signal-to-noise ratio: ≥80dB <br>Speaker: 1.77 inches (outer diameter 45MM) anti-magnetic, 4 ohms <br>LINE In interface: original line connection is required (speaker comes standard)1、Made of high quality fluorescence surface aluminum alloy, elegant and stylish in appearance. <br>2、Good sound quality lets you indulge in your favorite music. <br>3、Support TF card, USB disk, FM, etc..Supports USB 2.0 high speed transmission, fully compatible with USB1.1.Flashing LED at the base of the speakers.Due to the lighting effects and shooting angles, there is color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.Speaker*1</br>Audio cable*1