Check the listing for details. Sonic Alert Traditional System DB100 Doorbell Transmitter with Lamp Flash. Color: White, Condition: New. Listed at 98.99 USD. The full-featured DB100 doorbell signaler with doorbell button is wireless and installs easily. It features a chime, 64 user-selectable channels to prevent interference from a neighbor's signalers and an outlet for a lamp. The DB100 is compatible with all Sonic Alert receivers. Features:Selectable number of flashesDifferent flash codes for front or back doorWorks with most home intercom systems with separate additional doorbell button sensor (sold separately)Built in chime (can be turned off)Built in outlet to flash attached lamp64 user-selectable channelsCompatible with all Sonic Alert receiversWireless doorbell 12V battery included What else do I need to make this work?In order to be notified in additional rooms, you will need to purchase a receiver that lets you know when the signaler or transmitter is activated