Water resistant to 20 metres, Especially large display, Target zones with visible audible alarm, OwnCode - coded transmission, Stop Watch and Calander, Interval training function. Recovery function, Lap times with heart rate, Maximum/average heart rate of each lap. Temperature measuring, Altitude (maximum and minimum)Included in the box: Polar S720 wrist receiver Polar Coded Transmitter, Polar Speed Sensor, Polar Bike Mount, Polar S-series Precision ToolKit, CD-ROM (includin Polar Precision Performance Software). User's Manual: Specifications:Recording/Memory Functions,Total exercise time, Time in target zone (in, below, above). Average heart rate of total training. Maximum heart rate of total training. Training file info page. Downloads data to computer (infrared). Uploads data from computer. 99 exercise files available. Displays your heart rate as beats per minute, % of HRmax, average heart rate and exercise duration. Allows you to program your 5 favorite workouts (intervals, target zones and recovery function) locate desired exercise start. Records complete files of the exercises. Predictes your maximum oxygen uptake (VO2max).Reduces possible interference from other heart rate monitors that are close by. Sports watch features. Full function cycle computer: speed (current, avg., max), distance, altitude and temperature. Optional Cadence Sensor and Power Output Sensor available. Infra red communication allows for a quick two-way exchange of settings and exercise data with a PC. Polar Model # S720 / S-720 / S720i / S-720i