YOUR INSTALLS JUST GOT EASIER! Thanks to BEA's new and improved 433mhz Transmitter Receiver line of products.     1 MULTIPLE TRANSMITTERS   3 volt Single and Multi Button Flag Connector 3 volt and 9 volt versions available for standard push plates     2 BACKWARD COMPATIBILITY   Compatible with pervious line of transmitters and receiver     3 EASY SETUP   Dipswitches Pulse and Toggle Relay Hold Time Easy Learn Feature Receiver Programmable up to 100 Transmitters     4 EASY VESTIBULE   Innovative wireless vestibule sequencing built into receiver Eliminates the need for external sequencing module or wiring between doors