1、 There is lithium battery charging circuit and interface. And with CP2102 USB to serial port chip, it support for Arduino development environment. 2、With 0.96 inch white OLED display,  itis equipped with onboard 4 megabytes (32Mbits), flash and Wi-Fi antenna. 3、 The main control chip uses for Espressif ESP32, for Tensilica LX6 dual-core processor with 240MHz main frequency. 4、Operational capability can be up to 600DMIPS. And it is equipped with 520 SRAM, 8011 KB chip b / g / n HT40 Wi-Fi transceiver, baseband and LWIP protocol stack, Bluetooth. 5、About bluetooth, it can be bluetooth dual mode integrated traditional and BLE low power Bluetooth. 1 x Development Board1 x Power Cord2 x Pin Item Type: WiFi moduleMaterial: PCBProduct Size: Approx. 5 x 2.5 x 0.4cm / 2.0 x 1.0 x 0.2 inChip Type: CP2102 USB to serial port chipDevelopment Environment: Support for ArduinoDisplay: 0.96 inch white OLED display