SUITABLE FOR: This tool set is designed for various cable line installation, inspection, and maintenance tasks. It can assess telephone line conditions in different states and helps prevent damage to cable insulation. CONVENIENT: Establishes continuity in cables or wires, traces lines, and diagnoses breakpoints. MULTIFUNCTION: Receives tone signals on cables or wires, including telephone lines. Identifies active telephone line status such as clear, ringing, or busy. Sends single or dual tone signals on target cables or wires. HUMANIZED DESIGN: Features large rear speakers with loud o output, ensuring clear sound even in noisy environments. Includes intuitive button controls and indicator lights. Offers an effective detection range of up to 3000 meters. EASY TO USE: Packed with features and designed for simplicity, this cable finder is a reliable assistant for professional and practical use.