This is a small wireless hardware device based on NRF52840 chip, which supports device programming and communication via USB Support programming RGB LED, green LED, button and 15 GP / O Support Bluetooth thread, Zigbee, 802.15.4, ANT and 24GH Product features 1 programmable RGB LED 1 programmable green LED 1 programmable button Can be updated via USB DEU 15 GPOs and interfaces, accessible through slot solder joints along the edges color:As shown Material:PCB Package Contents: 1 x Development Module 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.