Bold, rugged GPS smartwatch is built to U.S. military standard 810 for thermal, shock and water resistance — with a large solar-charged display and durable 50 mm polymer case Solar charging: Power Glass lens extends battery life, producing 50% more energy than the standard Instinct 2 solar watch Infinite battery life in smartwatch mode when exposed to 3 hours of direct sunlight (50,000 lux) per day Built-in LED flashlight with variable intensities and strobe modes gives you greater visibility while you train at night and provides convenient illumination when you need it 24/7 health and wellness tracking helps you stay on top of your body metrics with wrist-based heart rate, advanced sleep monitoring, respiration tracking, Pulse Ox and more (this is not a medical device, and data presented is intended to be a close estimation of metrics tracked. Pulse Ox not available in all countries.) Gain a deeper understanding of your overall health, training and recovery through heart rate variability while you sleep, based on technology developed by our Firstbeat Analytics team Built-in sports apps to take on running, biking, swimming, strength training and more, plus VO2 max and other training features Multi-band signal reception technology delivers more accurate positioning than single band devices Navigate the outdoors with built-in sensors for 3-axis compass and barometric altimeter Integrated torchlight feature with SOS strobe mode commands attention in emergency situations