The Davis Instruments Wind Scribe Wind Meter uses ultrasonic technology to read current wind speed, maximum headwindand tailwind, 5-second average, and running average. WindScribe uses a wind barrel to create an inaudible audio signal, similar to the Doppler effect, that is processed with exceptional accuracy. Adjustable wrist lanyard for secure handheld use, and Velcro strap with mounting bracket useful for mounting to handlebars and struts.