These two models are heavy duty tested, and are built to be used hostile environments, such as all weather outdoors. The AC-Q42H Prox & PIN stand-alone controller, and AC-Q41H PIN only stand-alone controller have been designed to be the most cost effective anti-vandal solution for outdoor residential, commercial, and industrial applications. The controllers are capable of handling up to 500 users, with each user capable of being assigned with one ortwo codes, providing the capability to have three different security levels. The AC-Q42H contains a built-in proximity card reader enabling dual technology Prox & PIN codes for added security. Housed in a *metal resistant enclosure and completely epoxy potted, the AC-Q41H and AC-Q42H are ready to function rain or shine.