PHC AC-1822SA 18 VAC 2.22 Amp Transformer, 40VA, 3-screw terminal Input: 120VAC, Output: 18VAC at 2.22 amp max. (40VA) Configuration: 3-screw terminal Note: This is an AC to AC power supply, please make sure your device uses 18VAC input Please confirm the connection configuration before purchase Tips: voltage must equal to device requirement, amp rating must equal or greater than requirement