function (including Android and IOS device).
Module interface
    2 * UART;
    1 * ADC;
    1 * En;
    1 * alarm pin;
    1 * HSPI;
    1 * I2C;
    1 * I2S
    More than 10 * Gpio
operating temperature:
    -40 & # 8451; - + 125 & # 8451 ;;
Module size:
    16mm × 24mm
applications
    Electronic apparatus;
    Smart power plug, smart light;
    Infant monitor;
    Sensor networks;
    Security ID label;
    Wireless location beacon;
    Home automation;
    Mesh network;
    Ip camera;
    Wearable electronics;
    Wireless location recognition;
    Wireless control industrial;