This accessory kit from Klein Tools is perfect for finding circuit breakers in your home or workplace. It comes with everything you need to locate those hard-to-find breakers, including a transmitter, receiver, and a GFCI receptacle tester. The kit is easy to use and does not require any special tools or training. The Klein Tools 69411 Circuit Breaker Finder Accessory Kit is compatible with a wide range of circuit breakers and electrical systems. It is a reliable and efficient way to locate circuit breakers and identify which circuits are connected to which breakers. With free shipping included, this kit is a great value for anyone in need of a circuit breaker finder.