1800LM Diving Flashlight, 5 Modes Scuba Diving Flashlight, Magnetic Switch, Rechargeable, Waterproof to 100m, Ideal for Scuba Diving, Snorkeling, and Underwater Adventures

First, I am not a diver and I don’t have the background to review this light from an experienced diver’s perspective. I like dive flashlights because they are sturdy and simple to operate and bright and impervious to water. They are good general purpose outdoor flashlights so long as you don’t mind their weight. They’re great for walking through the woods or a dark campground, but they are definitely not EDC or tactical flashlights.This SecurityIng flashlight is equipped with a surprisingly good 21700 size Li-ion battery (a Panasonic NCR21700T), which has a higher capacity but is much less common than the usual 18650 batteries. It ships with a lanyard, a USB-C charging cable, 4 replacement o-rings, and a very brief user manual. Complete with battery and lanyard, the light weighs 229g (8.1 ounce). It appears to be very well constructed from thick and sturdy quality materials. It has 3 brightness levels (250, 800, and 1800 lumens) as well as strobe (very slow at 1 Hz) and SOS settings controlled by a magnetic rotary switch. Comparing it to other flashlights in the backyard, the claimed light outputs are entirely credible. The beam is narrow, with a small hotspot (15° is claimed and believable) and surrounded by wide and much dimmer spill. The beam quality is good, with no rings or dark spots, and I found it very pleasing.The battery can be charged by unscrewing the battery tube from the head of the flashlight to reveal a USB-C charging port and a tiny red/green LED that indicates charge status (the location of the charge port is not mentioned in the user manual or the listing). Or the tail cap can be unscrewed to remove the battery for separate charging. A pair of o-rings seal the light at both the tail cap and the light head.The flashlight feels good in the hand and the rotary switch operates easily. It can be stood on its tail cap very stably to point at the ceiling for general room illumination. I like this flashlight very much for general purpose applications and expect it would perform very well as a dive light.