Key Features Digital Tranmission for no cross-talk In zone indicator One target Heart Rate Zone with Time in Zone recall Recovery Rate Timer (1 or 2 minutes) BPM or % of Max Heart Rate display 27 Lap memory chronograph with lap/split display & 99 lap counter Countdown Timer 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