Features: 1.The circuit breaker tester identifies circuit breaker on energized electrical systems.Automatic sensitivity adjustment and automatic polarity selection remove ambiguity about readings. 2.Identify circuit breaker fast and efficiently.Quick and easy to use and extremely accurate readings.Always find the right breaker 3.The tester indicates the presence of a circuit breaker with a buzzers and an indicator light. 4.The tester includes a transmitter,which is plugged into an electrical outlet,and a receiver,which is powered by a 9V battery(not included). 5.Multifunctional: The circuit breaker works on powered systems from 90 to 250V AC and is suitable for house,office,residential and light commercial environments. 6.The Testers Green Led Lamp will Light up automatically to Indicate low voltage existence; the yellow to indicate moderate voltage; the red to indicate high voltage,ensuring your safe,helping you work in dark environments. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect.Please allow 1-3cm deviation due to manual measurement. 2.Objects may have Logo,if you want to know,please contact us.If you mind,please do not bid. Specification: Type: circuit breaker tester Working voltage: AC220V/50HZ Material: ABS Color: Black + Green Receiver Power Supply: 1 x 9V Battery (Not included) Receiver Size: about 20*3.8*5cm / 7.9*1.5*2.0in Socket Tester: about 6.3*7*5.5cm / 2.5*2.8*2.2in Application: home,office,plant power grid transformation,installation and engineering Circuit breaker search function: automatically adjust the sensitivity,quickly and accurately find the target circuit breaker Socket test function: Test whether the three-pin socket is connected correctly Open circuit of ground wire Reverse connection of ground wire and live wire Reverse connection of null line and live wire Open circuit of null line Other functions: Buzzers alarm and light prompt Flashlight lighting function Low battery alarm includes: 1 x Circuit Breaker Tester Finder Receiver 1 x Circuit Breaker Tester Finder Transmitter