Rescue Life LightA(R) for Life Jackets & Life RaftsUSCG-approved, the innovative Life Light provides 300 hours of full brightness and is visible for over two miles. It activates when immersed in salt or fresh water and deactivates when removed. This makes it ideal for use with a life raft where it can be brought in during daylight.Maintenance-free, Life Light's bright yellow housing is virtually indestructible, completely sealed and guaranteed against leakage and corrosion. Its non-replaceable lithium-ion battery lasts five years. The safety device is easy to attach to a PFD or raft with the included lanyard and Velcro strap.