Archon D22 Durable 1000LM Waterproof Scuba Diving Flashlight | Rotary Tailcap Switch - Built to Last
Low Battery Warning:
The light flashes 3 times when the power capacity reaches 10-5%; it repeats after 5 seconds, and then switches to lower brightness. The light switches off automatically when the power capacity is less than 5% (to avoid over-discharging).