1. Onboard for :bit interface, which can be directly inserted for use 2. Onboard buzzer, can play music 3. On-board capacitive touch chip, lead out 13 touch buttons, communicate with I2C interface 4. There are 4 colored lights on the board, and the color of the light group can be controlled with one signal line 5. Export the control pins of the module and the SPI and some GPIO pins on the for :bit, which is convenient for expansion and use Touch chip: TTP229 Lantern lamp beads: WS2812B Lantern color depth: 16777216 colors Dimensions: 85 x 56mm Working voltage: 3.3V color:Blue :PCB Package Contents: 1 x Piano Expansion Board for :bit 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.