9 Function Wireless Bicycle Computer. Current speed, speed comparator, ride time, trip distance, dual odometer for 2 wheel sizes, average speed, maximum speed, clock, and temperature. 4 line MacroMonitorTM LCD displays up to 5 pieces of data at a glance. Digital wireless technology eliminates messy wires. Fits 25.0 31.8mm handlebars. Magnet fits up to 4mm bladed spokes. Includes 82 cm wire mounting kit for front wheel. Case size: 40mm x 55mm. Height w bracket: 27 mm. For use with front wheel only. Weight: 88 grams with bracket and sensor. Lifetime Warranty.