Judge the continuity of cables or wires, track and find breakpoints. Easily install, commission, and maintain one or more telephone lines around your home or office. Features: Perfect for installing, debuging, maintaining telephone line and other wires or cables. Detect continuity of the cables or wires without damaging the insulation. Track the cables or wires, and find the break point. Receiver the tone signal on the cables or wires. Identify the state in the working telephone line. Send a solid tone or a dual alternating tone to the object cables or wires. Specifications: Send tone frequency: 1.5KHz Receiving frequency range: 100-300KHz Receiver battery: 9V, 800mAh Transmitter battery: 9V, 800mAh Receiver size: 238 * 43 * 26mm / 9.4 * 1.7 * 1.0in Transmitter size: 145 * 35 * 25mm / 5.7 * 1.4 * 1.0in Connector: RJ-11 Package size: 240 * 85 * 32mm / 9.4 * 3.3 * 1.3in Package weight: 360g / 12.7ounce Packing List: 1 * Transmitter 1 * Receiver 1 * Carrying Bag 1 * User Manual