Safety Technology International, Inc. STI-3300 Wireless Doorbell Extender with Receiver Connects to Existing Hardwired Doorbell, Part of Musical Wireless Chime Series

STI Wireless Doorbell Extender connects to your existing traditional hard wired doorbell system and extends a new chime to hard-to-hear areas. Once the unit is wired into existing system, the included receiver can be plugged into any standard electrical outlet. This allows you to hear when someone is at your front door when in remote areas. Normally open switch, 16 VAC. Doorbell button is water-resistant. It announces your visitors with a pleasant chime. Distinguish between front and back doors by adding sensors and selecting a different chime on each. Transmitters have up to 500 ft. operating range. Quick and easy to install – no wiring needed. Receiver plugs into 120 VAC outlet. Receiver has high and low volume adjustment.