Line hunting function: Rotate the transmitter knob switch to the "line hunting" position, hunting indicator light is always on, indicating that it has entered hunting function. Connect one end of cable/telephone cable to be tested to the RJ45/RJ11 port of the transmitter. Turn on the receiver knob switch, you can adjust the receiver knob switch to the maximum sensitivity, use the receiver probe close to the cable, when the receiver receives a signal, the receiver emits a "di di di" sound, the stronger the signal, the yellow-green signal The brighter the indicator light flashes, you can quickly locate the approximate position of the cable in this way. After determining the approximate position of the cable, appropriately reduce the receiver's signal sensitivity to accurately locate the target line. Line to line function: Rotate the transmitter knob switch to the "Alignment" position, the alignment indicator light is always on, indicating that the alignment function has been entered. The wire pairing function is mainly used to detect the wire sequence, short circuit, open circuit, and of cable, and display the test results in the form of wire sequence lights. Insert one end of cable to be tested into the RJ45 interface of the transmitter and the other end into the RJ45 interface of the receiver, and judge the condition of the cable by the light of sequence light Colour:Blue Material:ABS Package Contents: 1 x Transmitter 1 x Alligator clip adapter cable 1 x Receiver 1 set x RJ45 adapter cable 1 x Headphones 1 x Tool bag 1 x RJ11 adapter cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.