SUITABLE FOR - This tool set is designed for cable line installation, inspection, and maintenance tasks. It can assess 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 breakpoints. MULTIFUNCTION - Receives tone signals on cables or wires, including telephone lines. Identifies 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 for loud, clear sound output, suitable for 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 ease of operation, this cable finder serves as a reliable assistant for professional and DIY users.