High Sensitive Wall Detection Listening Monitor

High Sensitive Wall Detection Listening Monitor 

 Strong penetrability and high sensitive,let you hear the sound from the next room fully 
- Signal receiving by sonde only 
- With a little black box,easy to be collect 
- With build-in rechargable li-battery
Apply to:
- Business monitor 
- Intelligence forensics
On-board Buttons/Slots: 
- 3.5mm Earphone Jack 
- ON/OFF Switch Button with volume Dial 
- The charger USB hole
Operation:
- the end of the sonde must be closed to wall 
- turn on the device,and adjust the volume and the Shift still hear the voice most clearly
Highly Sensitive, carefully adjust audio slowly, as not to cause discomfort to your ear-buds
Battery type: 3.7V lithium-battery
Penetrability: Cement wall, Steel wall, wooden wall, iron wall, glass and air brick
Listening Devices: Headphones
Materials: Metal case with Internal Sound Amplifier
Approved: CE / FCC
After Sales Service: 1 Year Warranty