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Use with: NuTone transformer model 301-N* automatic resetting thermal protector* 16 volts* 30 wattsThe 301-N has been discontinued. Use the [http://www.nutone.com/product-detail.asp?ProductID=10924 301T transformer].Use with NuTone radio/intercoms to hear/answer intercom calls*Recesses in wall of house*Mounts beside door*Cast metal construction*Catalog Dimensions: 4-7/8" W x 6-1/2" H x 1-3/4"D*Actual Speaker Dimensions: 4-3/4"W x 6-5/16"H x 1-7/8"D [[Category:Intercom Systems]]