USB socket for supply, can be connected to mobile phone chargers or computer equipment for supply. It can be powered by an external mobile supply, and 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, , 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 : 3.5MM audio Speaker impedance: 4Q 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 and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.