Specification: Power supply voltage: DC36V-5V Onboard 18650 battery holder and charging circuit The battery can be charged and discharged simultaneously WiFi: supports 802.11B/G/N/E/I, supports STATION, SOFTAP, SOFTAP+STA modes, and supports 802.11N (24GHZ) On board 0.96 inch OLED screen On board charging indicator light green LED, power indicator light red LED Product size: 140 * 30 * 13mm/5.51 * 1.18 * 0.51inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x ESP8266 WiFi IoT Development Board 1. WiFi Connectivity: This development module features complete WiFi connectivity, supporting standard IEEE802.11B/G/N/E/I protocols and full TCP/UDP protocol stacks. 2. Easy-to-Use USB Connection: With a built-in CP210X USB-to-serial converter and micro USB port, this module can be directly connected to a computer for easy debugging and stable data transmission. 3. Versatile Power Options: The module includes a 18650 battery holder and charging circuitry, allowing for both battery-powered and USB-powered use. 4. OLED Display Screen: The built-in 0.96-inch OLED display screen provides easy-to-read information on the status of the module and its operations.