AQ-4 Personal strobe light. Personal emergency and multi purpose marking flasher. Manually activated. High intensity xenon flash strobe light. Light weight.Waterproof to 500m. Flash rate: 50 flash per minute. Operation up to 72 hours at 15°C with decreased flash rate at the end of battery life. Designed for personal safety and various applications such as diving, fire fighting, marking of personnel, objects, vessels, vehicles, targets and safety lifejacket marking.