TEC 40's elastomer handle gives improved grip and durability. Its compact halogen unit has the best power-to-weight ratio in its class. 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 Batteries: 4 AA Alkaline (supplied) Burn Time: 5 hrs. The highest of Princeton Tec’s ratings, Level 3 is assigned to lights that offer a degree of water protection equivalent to IPX8 in the International Electrotechnical Commission (IEC) standards. Lights rated at Level 3 provide waterproof integrity for continual submersion in water at depths down to 100 meters.