Highly Visible: Intense coloured light can be seen up to 5 km in darkness. Flashes over 200 hours on one battery. Multi-Functional: 3 output modes in one light flashing SOS signal flashlight Ideal for multiple applications Very Durable: Lifetime bulb (up to 100,000 hours) Operates from -40 to +50 Celcius; waterproof to 100 meters