The Buler Wireless Doorbell has the standard "Ding Dong" sound as well as the ability to Record your own Custom Doorbell Sound , personal message in any language or even your favorite mp3 music. The unit will work up to 150 feet with no major obstructions. The transmitter has a 12v battery already installed in it and receiver requires 3 AA batteries (not included) Units new SMT low power consumption circuitry Under average usage allows batteries to last up to 3 years without requiring to be changes Most recording doorbells use lower cost low sample rate recording chips . This unit has one of the best quality recording chips with very clear rich sound. FYI Other applications include using it as a Medical Call Alert where you record a personal message like " Mary needs assistance" and is activated when Mary pushes the transmitter.
