SUITABLE FOR: This tool set is designed for various cable line installation, inspection, and maintenance tasks. It can assess the status of telephone lines under different conditions, helping to prevent damage to cable insulation. CONVENIENT: Establish cable or wire continuity, trace cables or wires, and diagnose breaks or faults. MULTIFUNCTION: Receive tone signals on cables or wires, including telephone lines. Identify active telephone line statuses such as idle, ringing, or busy. Transmit single or dual tone signals onto target cables or wires. HUMANIZED DESIGN: Features large rear speakers for loud, clear sound output, ensuring visibility 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.