Feature: 1. Powerful Function: NF‑801B multi purpose line finder, supports telephone line tracking, network line tracking, power cable tracking function, open circuit or short circuit test, etc. 2. Widely Used: It is an irreplaceable practical tool for engineers and technicians in the installation and maintenance of weak current systems such as communication lines and integrated wiring lines. 3. Accurate Line Tracking: Support multi frequency pulse signal transmission, 8Vp‑p signal output level, fast searching, accurate testing, and meet the needs of line detecting. 4. Applicable Objects: Suitable for various departments that require metal lines such as telecommunication bureaus, Internet bar, telecommunication engineering, network engineering, and electric power engineering. 5. Small And Portable: This device is composed of transmitter and receiver, with smooth lines, easy to carry, intimate and humanized design, anti interference, and easy to detect. Specification: Item Type: Cable Detector Material: ABS Model: NF-801B Transmitter Battery: 6F22 9V x 1 (Battery Not Included) Receiver Battery: 6F22 9V x 1 (Battery Not Included) Purpose: Line Detection Product Name Multipurpose Communication Network Line Checker DC Maximum Working Current Launcher ≤10mA Receiver ≤30mA Signal Transmission Format Multi Frequency Pulse Signal Output Level 8Vp-P Signal Transmission Distance ≤2km Telephone Line Tracking √ Network Line Tracking √ Power Cable Line Tracking √ Network Line Proofing √ Open Circuit or Short Circuit Test √ DC Level Test √ Low Voltage Function Prompt √ Headphone Function √ Lighting Function √ Adjustable Volume Function √ User Target Audience Telecommunications Bureau Internet Bar Telecom Engineering Company Network Engineering Company Power Engineering Company Troops Various departments that need metal wiring . Package List: 1 x Receiver (Battery Not Included)1 x Transmitter (Battery Not Included)1 x Headphone1 x Clip2 x Adapter Line1 x Tool Bag1 x Manual Note: Do not expose this product to direct sunlight for a long time.