Sperry Instruments CS550A Circuit Breaker Finder, Quickly Locate AC Circuits/Fuses, Visual LED, Plug Style Transmitter/Auto-Sensing Receiver, 80-140V, Yellow Product Description Sperry Instruments CS550A Circuit Breaker Finder, Quickly Locate AC Circuits/Fuses, Visual LED, Plug Style Transmitter/Auto-Sensing Receiver, 80-140V From the Manufacturer Circuit Breaker Finder. By using a transmitter and receiver, this circuit breaker finder quickly and easily identifies individual branch circuits at the panel box without interrupting power. It is the best way to accurately locate circuit breakers. They are compact in size and extremely easy to use. UL listed to both US and Canadian standards. Locates AC Breakers or Fuses. No need to interrupt Power. Distinctive Signal, Audible and Visual Indication. Does not interfere with sensitive electronic equipment. Uses one 9V battery not included. Includes one transmitter and one receiver. Features QUICKLY AND EASILY: identifies correct circuit breaker or fuse protecting a specific electrical circuit SAFE FOR USE NEAR: Sensitive electronic equipment and no need to interrupt power when using INCLUDES: A plug style transmitter and an auto sensing receiver AUDIBLE ALERT AND BRIGHT LED: Visual indication on both transmitter and receiver DESIGNED FOR: Operation at 120V AC, 50-60Hz - UL Listed USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.