This compact halogen unit provides the highest power-to-weight ratio of any light in its class. The non-slip rubber grip ensures you'll be able to securely hold the light even if you're diving at 100 meters. The twist-activated switch prevents accidental turn-on. Power: 4 Watts / 28 Lumens Lamp: 1 Halogen Bulb Burn Time: 5 Hours Batteries: 4 AA Alkaline Weight: 181g Single Mode: Narrow 108m Beam Length