Description: 1.BLE high speed transparent transmission supports 8K Bytes rate communication.  2. Send and receive data without byte limit, support 115200 baud rate often send and receive data.  3. Support 3 modes of work.  4. Support(serial port, IO, APP) sleep wake up.  5. Support Wechat Airsync, Wechat applet and APP communication.  6. Support 4 channel IO port control.  7. Support high precision RTC clock.  8. Support PWM function(can be controlled by UART, IIC, APP, etc.).  9. Support UART and IIC communication mode, default to UART communication.     Technical Parameters:  1. Serial port transmission and reception without byte limit during transparent transmission.  2. Effective communication distance within 80 meters.  3. Working temperature: -40~+80°C.  4. Communication rate 8k Bytes per second.  5. Support UART and IIC communication mode.  6. Working voltage: 1.8-3.3V.     Factory default default parameter configuration:  1. Communication method: UART (SELECT pin is left floating).  2. Serial port baud rate: 9600 (AT+BAUD4).  3. Sleep mode: power on sleep, connection wake up (AT+STARTEN1).  4. Broadcast name: JDY-16 (AT+NAMEJDY-16).  5. Broadcast interval: 200MS (AT+ADVIN2).  6. Master-slave mode: Pass-through transmission (AT+HOSTEN0).  7. Output status: Connected or disconnected status is output from the serial port (AT+ENLOG1).  8. Broadcast LED indicator pin on (AT+ALED1).     Package included:  1 x JDY-16 Bluetooth 4.2 Module