1. Audio signal: 1.5kHZ
2. Receiving frequency range: 100HZ-300kHZ
3. Battery supply: 9V(6F22) x 2 (shipping does not include)
4. Can be used for a variety of cable line installation, inspection and maintenance, convenient for daily life
5. Can be used to determine whether the cable line continuous tracking cable line
6. Determine the location of the line break receiving cable lines (telephone lines) in the audio signal to determine the state of the working telephone line (idle, ringing, off the phone)
7. Send a single audio or dual audio signal to the target cable line
8. Dimensions: Receiving end 238 x 43 x 26mm, Transmitting end 145 x 35 x 25mm
9. Weight (with box): about 250g

Packing list:
- Receiver x 1
- Transmitter x 1
- Connection cable x 1
- Instruction manual x 1
- Cloth bag x 1