This light is a descendant of the popular ITP A3 (ITP and Olight are the same company) and the predecessor to the Olight i3s. It has slightly worse battery life than the A3 and is a couple mm longer, though it can tail stand and the A3 can not. The key ring sticks out to the side, so it does not hang straight on a keychain. The Olight i3s is a big improvement over the i3 and A3. It uses the newer and more efficient XP-G2 emitter (vs the XP-G in A3 and i3) and battery life is much improved - 8 hours on 20 lumen/medium. Mine just runs and runs.
Pros: 3 modes L>M>H, tail standing
Cons: So so battery life, strange key ring design...
Would recommend: No
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