1. ESP-32 is already integrated antenna and RF balun, power amplifier, low noise amplifiers, filters.2. The complete solution takes up the least amount of printed circuit board area. This board is used with 2.4GHz dual mode WiFi and Bluetooth chips by 40nm TSMC low power technology.3. The best power and RF properties, which are safe, reliable and scalable for a variety of applications.4. Supports three modes: AP, STA and AP + STA and compatible with Lua program, easy to develop.Size: 51.5x28.3mmOperating Temperature: -40 ~ +85Supply Voltage: 3.3Vcolour: blackMaterial: metalPackage Contents:5 x Development BoardOnly 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.