The Arrow Speed Radar attaches to the front of your bow and will measure the speed of your arrow from 150 to 450 feet per second, within ± 2 % accuracy and measures both alloy and graphite/carbon arrows. The Arrowspeed RADARchron® is microprocessor controlled, like a mini-computer, and indicates calculated feet-per-second arrow speed on a toggling two-segment liquid crystal display. The Arrowspeed RADARchron® is packaged in a rugged plastic housing, sealed to protect the internal electronics from dust, dirt and moisture encountered during normal use. It is triangular in shape, 2 1/2” wide; 3 1/2” long; and 1 3/16″ thick, weighing less than 3 ounces. Its’ one-button operation is simple to use. A three-volt, 160 milliampere-hour Lithium battery powers the electronics. This small N/3 size battery provides approximately 30 hours of operating life, representing over 3600 speed measurements. The Arrowspeed RADARchron® transmission level is well below that of most “wireless” consumer products such as mobile and portable telephones. Transmission characteristics are well within FCC requirements and prescribed safety levels. Microwave operation of the Arrowspeed RADARchron® eliminates problems due to light, shadows, loud noise and associated environmental effects that are deleterious to other archery velocity sensors when used outdoors.