Feature 1. 100% Brand new and high quality 2. Perfect for installing, debuging, maintaining telephone line and other wires or cables. 3. Detect continuity of the cables or wires without damaging the insulation 4. Track the cables or wires, and diagnose the break point. 5. Receiver the tone signal on the cables or wires (telephone line). 6. Identify the state in the working telephone line (clear, ring, busy). 7. Send a single solid tone or a dual alternating tone to the object cables or wires. 8. Include a sender (MS6812-T) and a receiver (MS6812-R). 9. A profeional & safe tool for wireman. Specification 1. Send tone frequency: 1.5kHz 2. Receive frequency range: 100 ~ 300kHz 3. Power supply: 6F22 9V (Not Included) 4. Receiver size: 23.8 x 4.3 x 2.6cm 5. Emitter size: 14.5 x 3.5 x 2.5cm 6. Shell Color: Green 7. Net Weight: 233g (Approx.) Package List 1 x Sender 1 x Receiver 1 x Pouch 1 x Instruction Manual