Features With the detection functions of network cable line sequence, line voltage, line short circuit, etc. The long‑distance line‑tracking function can be easily tested in the face of messy and long network cables. It is a necessary testing tool for telecommunication engineering, wiring engineering and network maintenance person. Lightings function, the receiver is equipped with brightness LED light, and low‑light environment auxiliary lighting work. Volume adjustment function, in a noisy environment, if the sound of the speaker is not evident, the volume can be adjusted up. Specification: Item Type: Line Finder Material: ABS Color: As shown in the picture Line-Tracking Signal Transmission Distance: >1km Display Mode: LED light Power Supply: Transmitter: 3x1.5V AAA dry battery (not included), Receiver: 1x6F22 9V dry battery (not included) Environmental Working Temperature: -10 ~40℃ (14 ~ 104℉) Relative Humidity: 10-95% RH Storage Temperature: -10 ~40℃ (14 ~ 104℉) How to Use: 1: The receiver and transmitter are respectively installed with batteries (battery not included) 2: Turn on, connect the transmitter and receiver to both ends of the network cable respectively, press the test button on the transmitter to test, and see the corresponding serial number flashing at the receiver. Package List: 1 x Receiver(Battery Not Included) 1 x Transmitter(Battery Not Included) 1 x RJ45 Test Line 1 x RJ11 Test Line 1 x RJ11 Test Line with Clip 1 x Cloth Bag 1 x Instruction Manual Package List 1 x Receiver(Battery Not Included) 1 x Transmitter(Battery Not Included) 1 x RJ45 Test Line 1 x RJ11 Test Line 1 x RJ11 Test Line with Clip 1 x Cloth Bag 1 x Instruction Manual