ECG accurate Heart rate. Time of Day (Shows date and day of week when HR off). Calendar (Two row display). Daily Alarm (plus hourly alarm option). Hi/Lo Target Heart Zone with audible and visual alarm. Scan feature showing Maximum, Average and Minimum heart rate for workout. Memory of scan data for previous workout, Automatically resets when new workout started. Electroluminescent Light. Lifetime warranty on chest transmitter. Self change batteries in both units.