Wireless Wind TransmitterFor the first time, you can have wind information without running cables down the mast. The Wind Transmitter measures Wind Speed and Direction and sends data to any Micronet display via a wireless link. It can be fitted (simple three-screw attachment) with the mast in place and makes un-stepping the mast easy too. Calibration for wind speed and direction is done at any display. Specifications: Instrument Function: Wind Box Dimensions: 4"H x 9"W x 20"L WT: 1.4 lbs UPC: 452359021630 Owner&';s Manual (pdf)