Identical in operation to the Polar Equine Easy (a1) monitor, the Equine Inzone unit includes addition functions that are accessable from the watch receiver. These include - Actual real time heart rate - High and Low heart rate limits with selectable audible alarm - The ability to display heart rate as a percentage of peak. - Average heart rate - Total exercise time - Maximum heart rate The watch receiver with Equine Easy (a3) monitor also features - Water resistance to 30Mtrs - Stopwatch facility, once the monitor is connected - Time of Day - Independent alarm - Calandar Additional Sulky extension kit available for use with driving/carriage horses. To ensure a good contact to the horses' skin,and correct heart rate reading, the use of an e.c.g. gel is recommended on the electrodes.