Features: 1. The circuit breaker finder can automatically adjust the sensitivity and quickly locate the target circuit breaker or fuse. 2. The socket tester can test whether the triangle socket connection is correct, and 3 indicator lights can show you the socket status. 3. With a flashlight, convenient to use in dark environments. 4. Supports low battery warning. 5. Suitable for power grid reconstruction and technical acceptance in office, home, factory, etc. Specification: Brand: MASTECH Model: MS5902 Working Voltage: AC 220V Plug Type: EU Plug Material: ABS Color: Black + Green Receiver Power Supply: 1 x 9V Battery ( Not included ) Receiver Size: 20 * 3.8 * 5cm / 7.9 * 1.5 * 2.0inch Socket Tester: 6.3 * 7 * 5.5cm / 2.5 * 2.8 * 2.2inch Package Weight: Approx. 298g / 10.5oz Package List: 1 * Socket Tester with Transmitter 1 * Circuit Breaker Finder with Receiver Note: When the yellow LED is on, please replace the battery in time. szbym02