ESP32 is already integrated antenna and RF balun, power amplifier, low-noise amplifiers, filters, and power management module. The entire solution takes up the least amount of printed circuit board area. This board is used with 2.4 GHz dual-mode Wi-Fi and Bluetooth chips by TSMC 40nm low power technology, power and RF properties best, which is safe, reliable, and scalable to a variety of applications. Features: Indicate LED inside(Green means full& Red means charging) Charging and working could be at the same time. 1 Switch could control the power,1 extra LED could be programmed(Connected with GPIO16) 0.5A charging current,1A output, Full ESP32 pins break out Over charge protection, Over discharge protection, Small volume, easily embedded to other products Strong function with support LWIP protocol, Freertos Supporting three modes: AP, STA, and AP+STA Supporting Lua program, easily to develop Specification: Model: ESP32 Battery: 18650 Battery (not included) Charging current: 0.5A Output current:1A Size: 90*30mm/3.5*1.2in Weight: Approx.26g/0.9oz Package list: 1 x ESP32 Board(18650 Battery is not included)