1.The Transmitter Injects A Signal Onto The Circuit, Which Can Be Detected By The Receiver. 2.The Receiver Will Beep And Its Green 3.Led Will Flash When The Signal Is Detected. 4.The Sensitivity Of The Receiver Can Be Adjusted In Order To Pinpoint The Exact Circuit Breaker Or Fuse Protecting The Selected Circuit. Specification: Receiver: 9V(6F22) Battery   1Pc(Not Included) Size: 186  90  38Mm Weight: About 150G Transmitter: Input Voltage: 1. 200~240V, At 50~60Hz (Europe Plug ) 2. 100~120V, At 50~60Hz(United Stated Plug) Note: The Actual Input Voltage Required Is Marked On Transmitter. Size: 80  50  31Mm Weight: About 55G
               
                
   
                 
              
                
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