Five months ago . We had complaints from customers about the waterproofing of Luminox watches . In oder to solve these problems for service and sales. We need to know what each generadtion Luminox effecdtively protect import just the 100 METER 200 METER 500 METER or different. The back cover of the watch is diffirent. Crown is diffirent . Waterproof protection. Actual ad. According to my understanding ,is a screw lock back cover and and a screw lock crown. The water pressure and water better. I was probably wrong. So I need to ask for an explanation as to how to fix the problem for the customer and jour employes.