Lithium battery interface (battery not include), 500mA Max charging current.

Product specifications:
Size: 57*25*14mm
Weight: 8g
Chip: ESP32-WROOM-32
Working voltage: 3.3V
GPIO: 28
Digital I/O Pins: 26
Analog I/O Pins: 12
Maximum computing speed: 240Mhz
USB chip: CP2104
Storage capacity: 4MBytes
Power plug: PH-2 2.0mm
Connection: Micro-USB

Package Included:
1 x 16pin
1 x 20pin
1 x ESP32 Board