Key Features Digital Tranmission for no cross-talk One target Heart Rate Zone with Time in Zone recall 50 Lap memory chronograph with lap/split display & 99 lap counter Five Target Zones based on m= Max Heart Rate & One Custom Zone Countdown Timer Recovery Rate Timer (1 or 2 minutes) BPM or % of Max Heart Rate display Review/ Recall Average & Peak Heart Rate & Calories Burned INDIGLO night-light with NIGHT-MODE feature Daily alarm Water resistant 100 metres HRM strap water resistant 30 metres (strap will not provide accurate heart rates when under water) Compatible with Data Recorder 2