Feature 1USE INDICATION: Tightly clamped crystal mouth interface, suitable for RJ45 network cable interface, RJ11 interface dual core, and telephone line can be transferred through crocodile clip cable. 2CONNECTION DETECTION: Insert the RJ45 connectors at both ends of the network cable to be tested into the transmitter and receiver interfaces, and set the transmitter function to the line to line function. Based on the line sequence light, determine the short circuit of the line. 3POLE, LEVEL DETECTION: Positive and negative pole detection, DC level test, turn the function selection to line search and press and hold the switch button for more than 2 seconds, the line sequence light will flash, insert the crocodile clip into the RJ11 socket, and clamp both ends of the power supply separately. 4WITH EARPHONES: Network cable tester comes with earphones, which can be worn for operation in noisy environments. The volume can be adjusted using a knob. 5WITH LIGHT: In dark or low light environments, you can turn the lighting switch up to turn on the light, convenient for you to continue working as usual.Item Type: Network Cable TesterMaterial: ABSColor: RedInterface End: RJ11, RJ45Battery: 6F22 9V battery x 2 (without battery)Automatic Shutdown: About 1 hour after startup, the line finder will automatically enter the shutdown state.Earphone Function: In noisy environments, earphones can be plugged in for operation to avoid external interference. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Emitter1 x Receiver1 x Crocodile Clip1 x Earphones1 x RJ11 Adapter1 x RJ45 Adapter1 x Storage Bag1 x Instruction