CatEye's speed and heart rate computer is the HR200DW, featuring wireless speed and heart rate. HR data is transmitted through an innovative and comfortable chest strap. Upper and lower zones feature audio alarms to keep your training at its most efficient. The 3-window screen, displaying 4 lines of data, is lit up by CatEye's white LED backlight. The computer is held in front of the handlebar with a new, fully-adjustable center mount bracket. Remote buttons are available separately. Functions Lap and split timer (up to 50 laps) Lap distance Lap average heart rate Lap average speed Current, Average, and Maximum speed Current, Average, and Maximum heart rate Elapsed tme Total time Clock Trip distance Odometer Elapsed time 2 Trip distance 2 Average speed 2 Calorie consumption Dual tire sizes A & B [100 to 3999 mm] Features Measures speed and heart rate New user friendly heart rate sensor 3 windows display 4 readouts Back light, lap timer and optional remote buttons Center mount bracket One heart rate zone Programmable odometer Programmable speed unit Pace arrow Specifications Handlebar mount size: 22-32mm Fork mount size: 11-50mm Battery: CR2032 x 2 (main unit) CR2032 x 1 (HR transmitter) Front fork mount wireless speed sensor Wireless sensor transmission distance up to 70cm - 27 inches