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Alert Yourself From Afar Leading the industry with a wireless working range of 1000 feet (300 meters), the Etekcity Wireless Doorbell Kit offers the convenience of hearing when visitors arrive at the doors from any location within a home or office. Simply plug the receiver into any wall outlet within range. The flashing blue LED light offers additional alert assistance for the hard of hearing. The option of 4 audio volume settings ensures the alert is never too loud or too quiet for any of the applicable environments the doorbell is purposed for, whether it’s used commercially or personally. An Expandable System of Convenience Merge multiple kits for multiple entrances. Have two separate transmitters at two separate entrances alerting all receivers with different distinct chimes. This handy and customizable feature allows you to know which entrance your visitors are located at. Add as many transmitters to the doorbell system as needed to have optimal convenience, no matter where you stand. This component also allows a user to simply extend the alert system of one transmitter across multiple additional receivers. This feature is highly beneficial for large houses, offices, and business buildings. Specifications Wireless Range: 1000 ft / 300 m maximum in the OPEN AIR Tunes: 52 selectable options Volume: 4 level adjustable levels (25db to 110 db) Receiver Power: AC 120V 60Hz Transmitter Power: 1 x 12V Alkaline battery 1 year included by Etekcity Package Includes 1 x Push Button (Transmitter) 1 x Chime (Receiver) 2 x Screws 1 x Double-Sided Adhesive Tape 1 x 12V Alkaline battery 1 x User Manual