AK2515 software upgrade, can be controlled by voice or by wire,The interface has been changed to Type-C, with one socket on the left and one socket on the back of the product, making it more convenient to use. The display area size of the display screen is approximately 134 x 26 millimeters. The thickness of the entire board is approximately 23 millimeters. (excluding protruding pin parts of components and film thickness) M3 screw hole center spacing: 170 x 44mm Power supply 5V/2A Material: Plastic + acrylic colour: black Package Contents: 1 x AK2515VFD voice controlled music spectrum indicator light 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.