Features:

1. Ear listening: Listening through wall devices to eavesdrop on wall microphones for voice errors.

2. Listen through the wall.

3. Special rear pull type vehicles with secret listening devices.

4. Easily listen to all movements.

5. High sensitivity metal probe.

6. Put on headphones.

7. Small if frozen.

8. Fully functional: charging hole, headphone hole, and upper part of switch knob.

9. Easy to operate, tightly attached to doors, windows, or walls.

10. Able to emit sound from wooden/brick walls, windows or doors, or armored panels.

11. High sensitivity detector.

12. Can be used for recording pens.

13. Usage:

1) Turn the main switch clockwise to start the device

2) Adjust the volume until a clear sound is heard

Product parameters:

1. Consumption current: 10mA

2. Use battery: 9V battery

3. Four segment audio selection

One section at 200Hz

Section B 800Hz

Part C 1200Hz

Section D 2000Hz

4. Sensitivity of measuring element: -70db

5. Maximum audio amplification: 20000X

6. Permeability: cement wall, steel wall, wood wall, iron wall, glass, Concrete masonry unit

7. Display style: Headphones with external speakers

8. Recording style: With an outlet hole, it can be recorded outside

9. Working temperature: -20 ° -50 °

10. Weight: approximately 140 grams

11. Size: approximately 43 * 36 mm/1.69 inches 1.42 inches

Packaging list:

1 x ear listening wall

1 earphone

1 USB cable