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Access Control System; Color Silver; Stainless Steel; Number of Lines 1; Ringer Yes; Mounting Type Surface; Height 6 1/8 in; Width 10 in; Depth 5 1/4 in; Volume Control Yes; Power 20 VA; Voltage 16V AC; Output Rating 20 VA @ 16 V AC; Operating Temp. Range 10 Degrees to 145 Degrees F; Requires Internet Connection; Includes Power Transformer