The blue Tec 400 Handheld Light from Princeton Tec is a handheld scuba diving light that can be used above or below the water surface during the day or night. The light offers water protection equivalent to IPX8 in the IEC standards and provides waterproof integrity for continual submersion at depths up to 328'. The light includes a halogen bulb and a krypton bulb, along with 4 C alkaline batteries to create a 50 lumen light beam. The rubber lanyard wrist strap allows for hands-free carrying.