Dive the 6.6 watt C4 with long lasting disposable alkaline C-size batteries in remote locations where there is no electricity. The long shelf life of alkalines will insure the light is ready when you need it in an emergency. Back home or where there is electricity, power the C4 up to its 10 watt maximum by adding the accessory Rechargeable Upgrade Kit. The unique dual lamp system allows you to switch between two different lamps underwater. Switch to a second lamp if the first burns out. When using the Rechargeable Kit switch between high-beam (10 watt) and low beam (6.6 watt).
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