Adjustable door chime with interchangeable parts
Aircraft safety alarm system
Alarm system
Alerting system using a communication protocol
Audio alarm signal initiation device
Automatic electronic date/mate finder and method of electronical
Controller for signalling system
Dog bark door bell notification and personal protection system
Doorbell base
Doorbell for pets
Electronic door chime
Electronic doorbell with reversible diode
Intelligent door plate and chime
Laser-aid fire evacuation guidance system
Method and apparatus for structural, actuation and sensing in a
Musical wireless alerting system
Pet operable annunciator
Prize announcement assembly and its manufacture
Programmable personal alarm
Removable door chime