ACR C-Light H20 Water Activated Personal Distress Light For location assistance during low-light emergencies Exceedingly bright 20 Lumen White LED Extensive continuous operating life of greater than 30 hours Waterproof - Tested for 24 hrs at 3.3 ft. (1m) Water activation sensors - Automatic activation when in contact with water Impact resistant case Uses two AA 1.5V batteries (not included) USCG/SOLAS Approved Ideal for life jackets, camping, biking, auto, etc. Included Velcro strap (with carded version) used in conjunction with integral lashing loops for mounting flexibility Included PFD clip (with carded version) for easy attachment to oral inflation tube