2.4 GHz dual-mode Wifi and Bluetooth development with 4 MB of flash. Powerful, small volume. Support LWIP protocol, Freertos. Support three modes: AP, STA, AP+STA coexistence mode. Compatible with for Arduino, Nodemcu, and MicroPython, can be programmed with for the Arduino IDE and Lua, can fit on a solderless breadboard, makes your development easier. The 2.4 GHz Wifi and Bluetooth dual-mode chip adopts low-power 40nm technology, which has the best power consumption and RF performance, safe and reliable, and easy to expand to various applications. Colour: black Material: plastic + metal Package Contents: 1 x Development Board Only the above package content, other products are not included. Note: Light shooting 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.