USB socket for power supply, can be connected to most mobile phone chargers or computer equipment for power supply. It can be powered by an external mobile power supply, and the game has a good sound. High-fidelity speakers reproduce the realistic scene and bring you an immersive music feast. Plug and play, widely used in mobile phone, tablet, notebook, desktop light 3.5mm audio interface equipment. Small size, portable, small size, big volume. Type: computer speaker Interface type: USB+3.5 audio Connection method: 3.5MM audio jack Speaker impedance: 4Q Power output: USB 5V Lead wire length: about 130cm material: plastic Colour: Black Size: 100x60x65mm Package Contents: 2 x Speaker Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.