More than one place makes '300' series lasers.
So quality & output differs.
The only common 'trait' is the 18650 batt.. Some hosts are better made ....some come with removeable piece in front w/ diff grates. afaik ALL are tailcap clickies or key w/ push button on side. I got a keeper from Alan at ebay (blab1391) he is 'KingKube' here. He is using a much better shipper and the wait time is less. He can find and offer almost anything you want and consistantly has the best prices.