Features 1、Mini size, compact and lightweight, embedded installation, very convenient. 2、With high Specification process, carefully welded, precise hole position, full-featured. 3、The main chip ESP32, wireless Internet access, the protocol is compliant with Bluetooth 4.2 / BLE. 4、Protocol 802.11 b / g / n / e / i (802.11n, rate up to 150Mbps). 5、ESP32, dual core Xtensa 32 bit LX6. Up to 240MHz. 520kB internal SRAM. 4MB external flash. 6、The regulator output is 3.3V / 600mA, and the RF transmission is up to 250mA. Specification Item Type: Module Main Chip: ESP32 Flash Chip: 25Q32 Charging IC Chip: TP4054 USB to Serial Port Chip Port: CH340C ESP32 VCC Range: 2.2V-3.6V VBAT: Direct Connection to Battery (And Charger) VUSB: Direct Connection to USB (5V) VCC: Regulator Output 3.3V / 600mA Up to 250mA for RF Transmission Wireless Internet: 802.11b / G / N / E / I WPA/ WPA2/ WPA2 Enterprise Edition / SPS Bluetooth: Bluetooth 4.2 / BLE Package List 1 x WiFi Bluetooth Module Development Board 2 x Pins 4 x Short Needles 2 x Long Needles