6″ diameter. Completely self contained unit is easy to install and use just plug into any 110 volt electric outlet. Offers instant signal every time, operating with up to 300 feet of signal hose. For use at service stations, bank or restaurant drive up windows, or any drive up application where an attendant needs to be alerted. – Milton Driveway Signal Bell with 50 Foot Hose///brand_for_product_detail=Milton,close_out=No,companydescription=Milton – Made in the USA,condition=New,condition_google=new,cost=70.110000,countrymade=Made in the USA,country_flag=no_selection,featured=0,flag=no_selection,identifier_exists=0,instock=in stock,is_recurring=0,madeinusa=1,manufacture_country=United States,product_image_size=Default,product_page_type=Default,smart_campaign_bestsellers=Smart Campaign Bestsellers,square_product_image=https://square-production.s3.amazonaws.com/files/418092c0ae4e0b490d183322f52f26f214b17aca/original.jpeg,store_price=107.550000,sw_featured=No,sync_update_msg=Modified in Magento by harryepstein on 11/04/2017,url_path=milton-driveway-signal-bell-with-50-foot-hose