Ace Tri Volt Transformer 2-1/2l X 2-1/4d X 2-1/8h Clamp On Door Chime Input: 120 Vac Output: 8 Vac-10 Va, 16 Vac- 10 Va, 24 Vac-20 Va Clamshell Discovery Con, Nbr, Sup, Hwu All items sold new in original packaging