You attach a lamp to the system and it will flash when the phone rings, the doorbell rings, etc. The AM-100 is for the doorbell and telephone. The AM-6000 has more features.
Several accessories are available for both systems.
Silent Call allows one person to wear a receiver and another to wear a transmitter for added security inside the home. 2-way radio with vibrating call alert allows people within the home to receive a vibrating signal and to talk to each other.