Aqualite S20
For general diving, Aqualite-S20 emits a medium wide beam and comes with a wrist or hand mount so that both hands are free during the dive.
The Aqualite-S 20 is powered by a rechargeable 18650-size lithium-ion battery, which is user replaceable. A battery charger and USB power cable are also included with the lights. Just plug into any USB port or power supply to charge the light. In the end, rechargeability saves money and has less of an impact on the environment.
The brightness for the Aqualite-S20 can be adjusted from 500 lumens to 90 lumens in 3 steps by punching the large button on the back of the light. Runtimes for the 2800 mAH battery included with the light range from 2-14 hours, depending on the power setting.
Construction of the Aqualite-S is engineered for maximum performance and corrosion resistance. The lamp head is turned from UK’s corrosion resistant alloy called Hydralum®.  The body is molded from high impact ABS and includes two 316 stainless steel ¼-20 screw sockets for easy attachment to a variety of accessories. The depth rating for the S20 light is 100 meters.