hdcarpentryMilwaukee M12 Flashlight compared to the New 4V USB rechargeable flashlight. The M12 has been impressive! Durable, strong, and bright are a couple of words that come to mind. The M12 is Ip54 rated so it can withstand the elements and dust. The new 4V is Ip67 rated. It is waterproof rated to 1 meter below water. The 4v is 700 lumins on high and the M12 is 800 lumins. The thing I like the most about the 4V, which should be named M4, is it fits in your pocket.