Features: When you're doing an ESP32 project, adding power to the power supply is very cumbersome, and this board can solve this problem. 18650 charging system integration, for LG 3000mAh 18650 battery can make ESP32 work properly. 0.5A charge current, 1A output, it also has a switch to control the power supply, and an additional LED programmable. With LED indicator light (green means full and red means charging), charging and work can be done simultaneously. With over-charge protection and over-discharge protection, there is no safety problem, you can use it with confidence. Specification: Material: PCB Size: Approx. 91.10mmx32.75mmx19.90mm/3.59x1.29x0.78inch Chipset: For ESPRESSIF-ESP32-WROVER 240MHz Xtensa single-/dual-core 32-bit LX6 microprocessor Flash: For QSPI flash/SRAM, up to 32 MB SRAM: 520 kB SRAM Key: Reset, BOOT Switch: BAT switch Power Indicator Lamp: Red USB to TTL: CP2104 Modular Interface: Secure Digital Memory Card, UART, SPI, SDIO, I2C, LED PWM, TV PWM, I2S, IRGPIO, capacitor touch sensor, ADC, DACLNA pre-amplifier On-board Clock: 40MHz crystal oscillator Working Voltage: 2.3V-3.6V Working Current: Approx. 40mA Sleep Current: 1mA Working Temperature Range: -40℃-+85℃ Power Supply Specifications: Power Supply: USB 5V/1A Charging Current: 1000mA Battery: 3.7V lithium battery Wi-Fi Description: Standard: FCC/CE/TELEC/KCC/SRRC/NCC Protocol: 802.11 b/g/n/e/i (802.11n, speed up to 150Mbps) A-MPDU and A-MSDU polymerization, support 0.4μS Protection interval Frequency Range: 2.4GHz-2.5GHz (2400M-2483.5M) Transmit Power: 22dBm Communication Distance: Approx. 300m/984.25ft Bluetooth Description: Protocol: Meet Bluetooth v4.2BR/EDR and BLE standard Radio Frequency: With -98dBm sensitivity NZIF receiver Class-1, Class-2&Class-3 emitter AFH Audio Frequency: CVSD&SBC audio frequency Software Specification Description: WiFi Mode: Station/SoftAP/SoftAP+Station/P2P Security Mechanism: WPA/WPA2/WPA2-Enterprise/WPS Encryption Type: AES/RSA/ECC/SHA Firmware Upgrade: UART download/OTA(Through network/host to download and write firmware) Software Development: Support cloud server development/SDK for user firmware development Networking Protocol: IPv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT User Configuration: AT + Instruction set, cloud server, For Android/iOSapp OS: For FreeRTOS Battery Model: 1x18650(not include) Package List: 1 x Development Board 2 x Pin 1、When you're doing an ESP32 project, adding power to the power supply is very cumbersome, and this board can solve this problem. 2、18650 charging system integration, for LG 3000mAh 18650 battery can make ESP32 work properly. 3、0.5A charge current, 1A output, it also has a switch to control the power supply, and an additional LED programmable. 4、With LED indicator light (green means full and red means charging), charging and work can be done simultaneously. 5、With over-charge protection and over-discharge protection, there is no safety problem, you can use it with confidence.