Designed for programming learning - block:bit supports online graphical programming of makecode. Scratch 3.0 graphical interaction and Python programming. Makecode Online Graphical Programming - Based on web , Makecode graphical programming could be programmed through web pages. It is applicable to computers, tablets and mobile phones, making programming learning more convenient. Sound Sensing - Equipped with sond sensor, interaction could be achieved through sound control by programming setting with Block:bit. Sound Playback - Block:bit is equipped with a buzzer module, which can easily play sound through the built-in programming module. Expansion - It can be used with extension boards or alligator clips. Due to different product batches, the appearance may be different, which does not affect use. Type:B:Expansion pack Kit Colour:Black Material:PC+Metal Package Contents: 1 * Expansion pack Kit 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.