We're Here To Help! e-mail: questions@lifewithease.com We'll Respond Quickly! Alertmaster AM-AX: Be Notified of Audio Alarms. Alertmaster audio alarm monitor notifies you when a continuous audio alarm,( such as oven timer, intercom, smoke detector, etc.) sounds Wireless transmission to master unit, no wiring or plug-in necessary Use with Alertmaster-6000 or RX2 Alertmaster AM-DX: Be Notified of Intercom use or door bell. Alertmaster Door Announcer monitor notifies you when a broken audio alarm, (such as ding dong, knock knock, beep beep etc.) sounds. Wireless transmission to master unit, no wiring or plug-in necessary Use with Alertmaster-6000 or RX2 Alertmaster AM-BX: Be Notified of Baby's Crying. Alertmaster Baby Sound monitor notifies you when your baby is crying. Wireless transmission to master unit, no wiring or plug-in necessary Use with Alertmaster-6000 or RX2 Alertmaster AM-SX: Be Notified When Someone Enters Your Home. Alertmaster® motion sensor notifies you when someone enters your home. Wireless transmission to master unit, no wiring or plug-in necessary Use with Alertmaster-6000 or RX2 Click Here For The Alertmaster 6000 Click Here For The Alertmaster AM-RX2 Remote Receiver