Multi-volt transformer can be used in 8 volt, 16 volt, or 24 volt applications. Use with up to 2 chimes, bells, buzzers, and other applications within specified ratings. UL (Underwriter's Laboratories) listed. 1.75 inches wide x 2.5 incheshigh x 2.25 inches deep. Weighs 1.1 pounds. 1 year warranty.