PHC AC-091A 9 VAC 1.11 Amp Transformer, 9VA, 2.1mm x 5.5mm Barrel Plug Input: 120VAC, Output: 9VAC at 1.11 amp max. (9VA) Configuration: Wall Plug with 2.1mm x 5.5mm barrel plug Note: This is an AC to AC power supply, please make sure your device uses 9VAC input Please confirm the plug size before purchase Tips: voltage must equal to device requirement, amp rating must equal or greater than requirement