Feature:

1. STRONG PENETRATION: High sensitivity sensing head using new components and advanced technology, so that the penetration increased by several times, greatly improving the sound quality, carefully and slowly adjust the voice frequency, so as not to cause discomfort to the ear plugs.
2. SOUND SENSITIVITY: High sensitivity metal alignment with headphones improves sensitivity and sound quality, high sensitivity detects sound from wall, window, doors or armor plate with headphones for clear sound quality.
3. APPLICATIONS : 3.5 mm headphone jack can be connected to display spectrum, voice recorder, transmitter, wireless devices, etc. (not included), also can be plugged into the dual channel line for direct recording, can detect abnormal noises from heating ducts, fire ducts, water pipes, underfloor heating ducts, automobile, home plumbing, and more.
4. WITH CHARGING INTERFACE: Through wall door microphone with charging interface, the built in battery can be charged repeatedly, fully charged once available 5 to m7 hours, machine jack and upward switch knob, easy to use and adjust.
5. EASY TO OPERATE: Press firmly against doors, window and wall and adjust the sound with the knob until you hear a clear sound, able to emit sound from wooden wall, bricks, window and doors, effective noise filtering and faster sound detection.

Specification:

Item Type: Through Wall Microphone Amplifier
Material: ABS
Amplifier Battery: Lithium Battery (Ship with Inbuilt Battery)
Capacity: 100 mAh
Sound Input: 32ohm Headphones
Probe Sensitivity: -60dB
Maximum Voice Frequency Amplification: 13000X
Working Time: 5-7 Hours Probe
Power Consumption Current: 12mA
Use: Can Detect Heating Pipes, Fire Pipes, Water Pipes, Floor Heating Pipes, Automobile Abnormal Noise, Household Pipes

Package List:

1 x Through Wall Microphone Amplifier (Ship with Inbuilt Battery) 

1 x 3.5mm Earphone

1 x USB Cable

1 x Instruction Manual