The E-30 hands free phone is designed to provide quick and reliable hands free communication and can be connected directly to a C.O. line or analog PABX/KSU station. The E-30 can be programmed to dial up to 5 different numbers on ring no answer or busy and can be configured to dial these numbers until answered.The E-30-EWP shares all of the features of the E-30 in addition to Enhanced Weather Protection (EWP) for installation in harsh environments.The Push to Talk Door Phone features non-volatile memory, a built in dialer, and intelligent call progress detection for automatic hang-up when the call is completed. EWP products feature rubber gaskets and boots, hand soldered silicon sealed connections, gel-filled butt connectors, as well as urethane potted circuit boards with weather sealed, field-adjustable trim pots and DIP switches for easy onsite programming.