Function: 1. The circuit breaker finder automatically adjusts sensitivity to quickly locate the target circuit breaker or fuse. 2. The socket tester checks the correctness of triangular socket wiring, with 3 indicator lights displaying socket status. 3. Built-in flashlight for convenient use in dark environments. 4. Supports low battery warning. 5. Suitable for power grid restoration and engineering acceptance in offices, homes, factories, etc. Specification: Brand: MASTECH Model: MS5902 Operating Voltage: AC 110 V / 220 V Plug Type: US plug, EU plug (optional) Material: ABS Color: Black, Green Receiver Size: 20 x 3.8 x 5 cm / 7.9 x 1.5 x 2.0 in Socket Tester Size: 6.3 x 7 x 5.5 cm / 2.5 x 2.8 x 2.2 in Package Weight: Approx. 298 g / 10.5 oz Package List: 1 x Socket Tester with Transmitter 1 x Circuit Breaker Finder with Receiver