Features: 1. The circuit breaker finder can automatically adjust sensitivity and find the target circuit breaker or fuse quickly. 2. The socket tester can test whether the triangle socket connection is correct and 3 indicator lights can show the socket condition. 3. Built-in flashlight for convenient use in dark environments. 4. Supports low battery warning. 5. Suitable for power grid rebuilding and engineering acceptance in offices, homes, factories, 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*2.0in Socket Tester Size: 6.3*7*5.5cm / 2.5*2.8*2.2in Package Weight: Approx. 298g / 10.5oz Package List: 1 x Socket Tester with Transmitter 1 x Circuit Breaker Finder with Receiver Note: When the yellow LED is on, please replace the battery promptly.