Plug in your own battery to enjoy the ultimate stereo sound! Low-voltage protection is our first concern. The Bluetooth 5.4 supports wireless connection of two speakers with one mobile phone, and the dual-diaphragm left and right channels independently output true 6D surround sound. Professional speakers, powerful sound effects,Stereoscopic panoramic sound effects, feel every detail of the music. Power bank function,USB and Type-C output ports for emergency charging of other small appliances. Cool and colorful atmosphere lights,Good-looking and high-quality, the light color can be switched at . Protection function:overvoltage protection Application scope:For 18-20V Lithium battery charging Input parameters:100HZ-20KHZ Signal to noise ratio: equal 70db USB output parameters: 5V 2.1A Type-C output parameter: 18W Type:LUB Colour:As Shown Material:ABS Package Contents: 1 * Bluetooth Speaker(Battery not included) 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection 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.