Basic white textured cover for a design that blends with builder finishing techniques for multi-family dwellingsFor use with two entrances, two-note chime for front door, separate one-note tone for second door so no guest will be missedOrder as standard pack of 24 to assist with your planning and still retain that economical edgeChime wires to a 16-volt transformer so you are assured of uninterrupted service and are never dependent upon batteries (use transformer C905, sold separately)Pushbutton sold separately to give you freedom in choice of stylesRefer to your local municipality building codes to be sure you are installing chimes that adhere to code since they vary by region