With 3 modes of operation (strobe, steady-on, SOS), the C-Strobe H2O boasts a 45 lumen LED that operates typically for 120 hours continuously in strobe mode.The C-Strobe H2O model includes two activation methods; the light can easily be activated with a simple push of the On/Off button or when in the armed position, can be activated automatically when immersed in water, making this an ideal light for all outdoor enthusiasts. 
The slim, lightweight and versatile design fits easily in a pocket or hangs discreetly when attached to a life jacket or backpack.The flexible lashing loops on the side of the product allow for multiple mounting options including the webbing on your backpack or straps on your life jacket.The Velcro strap can be secured around the lashing loops and creates countless additional mounting possibilities.The light also comes with a clip designed to conveniently slide over your inflatable life jackets oral inflation tube for storing your light inside your life jacket. 
Features:

• For location assistance during low-light emergencies
• 3 Modes  Strobe, Steady-On, and SOS
• Exceedingly bright 45 Lumen White LED
• Extensive continuous operating life of greater than 120 hours (strobe mode)
• 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
• 5.56" x 1.38" x 1.2" (14.1 x 3.5 x 3.0 cm)