Features: brand new and high quality Sniffing function, with CP2102 serial port chip for serial communication development. Support serial -wakeup. Support MAC- binding connection, support IBeacon and ordinary broadcast switch. Support Bluetooth-compatible BLE5.0 protocol, the module has high stability and ultra-low sleep power consumption. Users can access external power supply and serial ports by themselves. Stable work and easy to develop. With USB interface, it can be directly plugged into the computer for use. Specifications: Material:PCB Size:Approx.4.8x2.8cm/1.89x1.1inches Color:Blue Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Test Board Test Kit