Buttonless design allows for maximum data display in a minimal size computer. Nine functions and dual bike capability. Mode changing is easy - just push the computer forward in its spring-loaded bracket. The computer is the button! The Protege Series are great for training, touring, or keeping track of car-free miles. Specifications: Four-line, easy-to-read macro-monitor LCD display provides up to five pieces of data at a glance Heavy-duty, oversized wire harness and ultrasonically welded case ensure a durable, weatherproof unit Mode changing is easy: push the computer forward in the spring loaded bracket- the computer is the button Auto start/stop and LCD shut off Fits 25.0-31.8mm handlebars Weight: 57 grams with bracket and sensor Current speed. Maximum speed. Average speed. Total distance. Trip distance. Clock. Ride time. Dual tire. Auto start/stop. Pace and temperature. May not work on most recumbent bikes and trikes requiring a unique mounting configuration, because the wire harness is too short. A long wire kit is no longer available. If you are buying this for a Volae, you will not need a longwire kit.