The RC3196 is the perfect door chime for new installations or for replacing existing door bells. The unique design of this chime makes it perfect to fit in the corner of homes, apartments, mobile homes, RV's, etc. Once installed the top of the unit becomes a handy shelf for decorations or personal effects. It has a 150 foot operating range and allows you to change the chime easily. The chimes include a Westminster Chime, My Country 'Tis of Thee, Hail, Hail, the gang's all Here, the Twelve Days of Christmas, and many more. This unit also comes with 32 selectable codes to block interference from outside signals. It works from -30 F degrees up to 130 F degrees. The door chime requires 4 C-cell batteries (not included); the button requires 2 CR2032 3v lithium batteries that are included. The door chime measures 7 1/2" long x 6 1/2" at the widest point and 5 1/2" high.