The LifeTag by Raymarine is a personal man over board safety system. LifeTag ensures the safety of up to 16 tagged crew members by constantly monitoring their location via radio frequency. Should a crew member go too far from the base station (about 30 ft.), the alarm will sound alerting fellow crew members of the situation. Each LifeTag pendant is easy to use and wear. It only weights 1.5 oz. and is easily strapped to an arm, life jacket, or foul weather gear. If your vessel is already equipped with a Raymarine chart plotter or radar, the LifeTag can be networked using Seatalk to automatically save the position of the boat when the crewmember fell overboard. This system is cheap insurance to ensure the safety of crew members or pets. Features include: Compact, lightweight wireless pendants unobtrusive and easily attached to PFD's, harnesses, belts, pets and more, RF radio-link covers a 30 ft. radius around the base station, Manual activation button for on-board emergencies, Extra-loud alarm to roust and alert onboard crewmembers, SeaTalk network integration with Raymarine Multifunction Displays and Instrument Systems, Built-in relay contact for triggering external devices, Powered by off-the-shelf CR2 Lithium batteries, operational battery life 2000 hours, Integrated LED status indicator for network and battery status, Easily expandable for up to 16 crewmembers, and Expandable to cover larger vessels by adding additional base stations. The individual LifeTag Wireless Pendant comes with a CR2 3V lithium battery and strap. Add it to any LifeTag Wireless MOB system to protect up to 14 additional crew members.