Ultrak BTS Bluetooth Stopwatch Compatible with both Apple and Android Smartphones, supports iOS 7.0 or above, supports Bluetooth 4.0 or above Stopwatch can measure up to 10 hours in 1/100 second, multiple event/segmented memory records and recalls up to 750 dual splits and stores up to 250 individual data blocks User profile creation with data keeping and memory recall, countdown timer with repeat function and timing range of up to 9 hours, 59 minute, 59 second Programmable pacer from 5 to 240 beeps per minute and up to 10 memory, stroke frequency function with memory, time, calendar and alarm Low battery indication, water resistant, 5-year Warranty