Item Type: Data Acquisition Module Material: Plastic Support System: For Windows 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/WIN8 32 Bit/64 Bit Wireless Serial Port Transmission: USB Wireless Serial Port Transmission Module, Support at to Configure the System Clearly CH340T Chip: Use Stable CH340T Chip As Usb to Serial Port. Multi Frequency Points: 125 Frequency Points, Meeting the Needs of Multi Points Communication and FM Communication. LED Lights: the Two LED Lights of the Module Are Power Indicator (Red) and NRF24L01 Status Indicator (Blue/Green). Built in Watchdog Anti Driver Program: It Can Run Stably in Harsh Industrial Control Situations. Transmission Distance: Using This Module for Wireless Serial Communication Can Make the Transmission Distance Farther (100~1100m, Depending on the Power of the Wireless Module Used), Far Exceeding the Transmission Distance of the BTSerial Port (10m) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.