SUITABLE FOR - This tool set is designed for cable line installation, inspection, and maintenance tasks. It can be used to evaluate telephone line conditions in various states and helps prevent damage to cable insulation. CONVENIENT - Establishes continuity in cables or wires, traces线路 paths, and diagnoses breaks or faults. MULTIFUNCTION - Capable of receiving 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 onto target cables or wires. HUMANIZED DESIGN - Features large rear speakers that produce loud sound, ensuring audibility even in noisy environments. Includes intuitive button controls and indicator lights. Offers an effective detection range up to 3000 meters. EASY TO USE - Packed with features and designed for ease of operation, this cable finder serves as a reliable assistant for professional and DIY applications.