Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: MASTECH MS6812 Network Cable Tester Line Tracker Telephone Product 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 diagnose the break point. Receiver the tone signal on the cables or wires (telephone line). Identify the state in the working telephone line (clear, ring, busy). Send a single solid tone or a dual alternating tone to the object cables or wires. Include a sender (MS6812-T) and a receiver (MS6812-R). A professional & safe tool for wireman. Specifications: Send tone frequency: 1.5kHz Receive frequency range: 100 ~ 300kHz Power supply: 6F22 (9V) Receiver size: 23.8 x 4.3 x 2.6cm Emitter size: 14.5 x 3.5 x 2.5cm Receiver weight: 106g Emitter weight: 114g Package size: 25.5 x 12 x 4cm Package weight: 296g Package including 1 * Sender 1 * Reciever 1 * Pouch Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.