SUITABLE FOR - This tool set is designed for various cable line installation, inspection, and maintenance tasks, allowing assessment of telephone line performance in different conditions. Helps prevent damage to cable insulation. CONVENIENT - Establish continuity of cables or wires. Trace cables or wires and diagnose breakpoints. MULTIFUNCTION - Receive tone signals on cables or wires (telephone lines). Identify the status of working telephone lines (clear, ringing, busy). Emit a single sliding tone or a double tone on the cables or wires being tested. HUMANIZED DESIGN - Equipped with large rear speakers for loud sound, making it audible even in noisy environments. Features an intuitive button and indicator light, with an effective detection range of 3000m. EASY TO USE - This cable finder is functionally rich and user-friendly, serving as a reliable tool for your needs.