HEH1016 Features: * Ten-volt lock-nut transformer * Material: Metal * Transformer is a lock nut type * Low voltage hardwired transformer * Wired door chime transformer Specifications: * Input: 120 VAC * Output: 16 VAC-10 VA Assembly Instructions: * No assembly required Dimensions: * Dimensions: 2.5"" H x 2"" W x 2.25"" D Warranty: * 1 Year manufacturer"s warranty