The LED C-Light is a manually activated steady-on personal distress light with dramatically improved operating life. This rugged little waterproof light is USCG/SOLAS approved and has a 20 lumen LED that operates typically for 30 hours continuously. The C-Light is activated manually with an easy twist On/Off activation making this an ideal light for all outdoor enthusiasts. Requires (2) AA Batteries, not included. When used for commercial fishing applications on life jackets or immersion suits, batteries MUST be replaced annually.