Equipped with high-performance XtensaR 32-bit LX7 dual core processor, with main frequency up to 240MHz. Support 2.4GHz Wi Fi (802.11 blg) and Bluetooth R5 (LE). Built in 512KB and 384KB ROM, stacked 4MB Flash and 2MB PSRAM. It adopts stamp hole design and on-board ceramic antenna, which is easy to be integrated into the base plate designed by users. Support flexible clock, separate module power setting and other controls to achieve multi scene low power consumption mode. Integrated USB serial port full speed controller, , leading out 34 GPIOs to flexibly configure peripheral functions. Colour:Blue Material:Plastic+Metal Package Contents: 4 x Development board 8 x Pin header 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.