Transmitter with doorbell remote button does not work with existing doorbell chime. May be used with any Silent Call receiver. 5 Year. The doorbell is activated by same current that operates chime. The doorbell transmitter operates on a standard 9v battery not included. Velcroandreg; brand fastener included to easily attach the doorbell transmitter to the wall next to the chime or to the chime unit cover. Never install the doorbell transmitter on a metal door - they can interfere and shorten the range. 5 Year Mfg Warranty.