Features : * Only 4 wires instead of 7 to connect with 4-wire access control modules  * In-field firmware upgradeable via CONV4USB and WinLoad  * Adjustable red/green LED intensity and buzzer frequency  * Extreme weather-resistant design (injected rubber gasket and PCB cover)  *Tri color LED display  * Available in 3 colors (white , silver and black) .       Model : PA3579     Manufacturer : Paradox