1. The circuit breaker finder can automatically adjust the sensitivity and quickly find the target circuit breaker or fuse.2. The socket tester can test whether the triangle socket connection is correct, and 3 indicator lights can tell you the socket status.3. With flashlight, convenient to use in dark environment.4. Support low battery warning.5. Suitable for power grid reconstruction and technical acceptance in office, home, factory, etc.Specification:Features:1. The circuit breaker finder can automatically adjust the sensitivity and quickly find the target circuit breaker or fuse.2. The socket tester can test whether the triangle socket connection is correct, and 3 indicator lights can tell you the socket status.3. With flashlight, convenient to use in dark environment.4. Support low battery warning.5. Suitable for power grid reconstruction and technical acceptance in office, home, factory, etc.Specification:Brand: MASTECHModel: MS5902Working voltage: AC 110-220V.Plug type: EU plugMaterial:ABSColor: black + greenReceiver Power Supply: 1 x 9V Battery (not included)Receiver size: 20*3.8*5cm/7.9*1.5*2.0inchSocket Tester: 6.3*7*5.5cm / 2.5*2.8*2.2inchPackage Weight: Approx. 298g/10.5ozList of packages:1 x Socket Tester with Transmitter1 x Circuit Breaker Detector with Receiver1 x Storage Bag1 x ManualNote: When the yellow LED is on, please replace the battery in time.