Jotron ML-100 White Led 25-flash at 5 Cd- Powered by 3 alkaline D-sized battery cells- Light intensity: 5- or 15- Candela- Surface range: 2 or 3 Nautical Miles- Waterproof down to 500 meters- Activation switch, magnet/reed and daylight-sensor- Flas rate: 25 flas/min- Expected operation: 32 days