This doorbell is the longest transmission range known with a 4000 feet line of sight. The doorbell can also function as a magnetic contact for The receiver has many options including excellent volume control. This versatile chime may be used as a Long Distance Mail box alert This Universal Transmitter may be used to extend the range of any Dakota Alert 4000 series for many different applications. When used as a Doorbell the RC 16 Kit ( UT /DCR 4000 ) is the only doorbell that will transmit a wireless signal thru a steel fire door to the receiver easily 600 feet away .

Warranty is for one year

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