Feature: 1. External earphones are used to isolate noise. If the environment is noisy during line hunting, you can bring earphones for monitoring. 2. The volume can be adjusted according to the environment, and the volume can be easily controlled by turning the dial lightly. 3. With receiver light, without fear of the dark environment, easily solve the trouble of dark area operation in the construction site without light source. 4. The product has a high‑standard line interface, you can find the line on and off. 5. Widely used in a variety of situations, such as engineering wiring, computer room maintenance, etc. Specification: Item Type: Line Finder Auxiliary Functions: Flashlight function, earphone function, volume adjustment, transmitter low voltage prompt Testable Wires: Network cables, telephone cables, audio and video cables, power cables (tested by the clip line without power). Working Temperature: 0-40℃, maximum 80% relative humidity (non-condensing) Storage Temperature: -10-50℃, maximum 80% relative humidity (non-condensing) Tracking Distance: 0-1000 meters Power Supply: 2x1.5V AAA (Battery Not Included) Transmitter Size: Approx. 120 x 50 x 25 mm / 4.7 x 2 x 1 in Receiver Size: Approx. 184 x 42 x 25 mm / 7.2 x 1.7 x 1 in Weight: Approx. 292g / 10.3oz. Package List: 2 x Host (Battery Not Included) 1 x R11 Clamp Cable For Testing1 x RJ45 Network Cable For Test Line Sequence1 x Test Dedicated Headset1 x Portable Cloth Bag1 x Manual Note: 1. Do not use the product if the shell is broken2. Do not use in an environment with flammable gas and high humidity3. Do not use abnormally without battery cover or back cover installation4. Before opening the back cover, it must be disconnected from the line under test5. Do not try to repair or modify this product6. Use appropriate private safety equipment, such as insulating gloves, insulating shoes, and insulating pads7. It is strictly forbidden to use the product in contact with high voltage (more than 36V or commercial power), it is very likely to burn the product or erroneous test results8. Operate the clamp to clip the wire, and it is strictly forbidden to directly touch the wire9. Headphone monitoring, only used to test the uncharged situation10. It is strictly forbidden to use this product in thunderstorm weather