description sperry instruments cs550a circuit breaker finder, identifies correct circuit or fuse, audible/visual alert, 120v ac, 50 to 60hz sperry makes the job of locating electrical circuits (ac circuits of 110-125 volts) quick and easy. turning off the correct breaker is critical when considering work on an electrical circuit and can take an excessive amount of time using "trial and error" until you hit the right one. this circuit breaker finder features a sending unit which you plug into a receptacle in the room where you want to work and a receiving unit which you use to test the breakers to correctly identify the right breaker every time. the receiver features both a visual flashing light and an audible beeping to alert you when the correct breaker is identified. the package includes a user manual and a 9 volt battery required for the receiver unit. a video demonstrating how to correctly use the product is located at www.sperryinstruments.com for easy reference. unit includes a 1 year warranty. california proposition 65 warning. view warning label features quickly and easily identify correct circuit breaker or fuse protecting a specific electrical circuit designed for operation at 120v ac, 50 to 60hz audible alert and bright led visual indication includes transmitter and receiver requires no service interruption receiver operates from one 9 volt battery specifications ac voltage 120 acme tools brand name gardner bender acme tools part number cs550a assembled weight (lbs) 0.5 battery quantity required 1 battery size 9 volt california proposition 65 warning required yes color / finish yellow country of origin china dc polarity indicator no dc voltage 0 digital / analog analog digital display no electronic yes globaltradeitemnumber (gtin) 00035632104444 internal supplier part # cs550a internet product code (ipc) c295acb64bf manufacturer warranty lifetime limited material polycarbonate package weight 0.5 package weight (lbs) 0.5 shipping weight (lbs) 0.5 tester type circuit upc 035632104444 visual / audio alert audio/visual