---
product_id: 129380857
title: "New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years)"
brand: "hotsell999"
price: "€ 257.47"
currency: EUR
in_stock: true
url: https://www.desertcart.gr/products/129380857-new-f999b-super-sensitive-listen-thru-wall-contact-probe-microphone
store_origin: GR
region: Greece
---

# FM Transmitter High Sensitivity Built-in Lithium Battery New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years)

**Brand:** hotsell999
**Price:** € 257.47
**Availability:** ✅ In Stock

## Summary

> 👂 Listen Beyond Walls - Your Secret Sound Companion!

## Quick Answers

- **What is this?** New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) by hotsell999
- **How much does it cost?** € 257.47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/129380857-new-f999b-super-sensitive-listen-thru-wall-contact-probe-microphone)

## Best For

- hotsell999 enthusiasts

## Why This Product

- Trusted hotsell999 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **📡 Wireless Freedom:** Seamlessly transmit audio without the hassle of wires.
- • **🔋 Long-lasting Power:** Enjoy up to 5 hours of continuous monitoring.
- • **🛡️ 5-Year Warranty:** Peace of mind with our extended warranty coverage.
- • **🔍 Unmatched Sensitivity:** Experience sound detection like never before.
- • **🎧 Superior Sound Quality:** Immerse yourself in crystal-clear audio.

## Overview

The New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System is a cutting-edge audio monitoring device designed for professionals seeking high-quality sound detection. With its advanced metal receiver and handset, built-in lithium battery, and FM transmitter, this system offers unparalleled sensitivity and ease of use. Ideal for discreet monitoring, it comes with a 5-year warranty, ensuring reliability and performance.

## Description

Specification Electric Current Exhaust: 10mA Battery type: 3.7V lithium-battery Continuous monitoring for 100hours Four Audio Choices: A (200MHz) B (800MHz) C (1200MHz) D (partition boogie monitoring) Sounder`s sensitivity: -70db, the maximum times of amplifying the audio: 2000 times Penetrability: Cement wall, Steel wall, wooden wall, iron wall, glass and air brick Answering patterns: Headphones, recording, wireless FM emission Package includes: 1 x Sonde contact microphone 1 x Probe / Needle microphone 1 x Microphone / Headphone Amplifier 1 x 2.5mm-3.5mm stereo record lead 1 x Charger 1 x Metal carry case

## Features

- Highly Sensitive Sound Detector Wall Contact probe Microphone Amplifier voice bug ear listen system
- F-999B is a high sensitive partition monitor, which is perfectly constituted by metal receiver, metal handset with superior detecting ability and high-quality headphones, making it more sensitive and sound-qualified. It owns built-in Lithium battery and unique FM transmitter function, easy to be manipulated and carried
- Put the earplug into headphone hole, the sounder into the MIC hole, and clockwise rotate the "switch on/off" button of the volume. When the indicator light of the power works, booth the machine and adjust the volume, smoothly stick the sounder to wall the need to be monitored, adjust the gear-choice buttons A B C until you can clearly hear the sound from the room.
- If you need to do the sound recording, you can use recording equipment's to go through the mouth of the recording to connect the audio cable for recording. Also, F-999B has another special FM wireless emission function, with specialized FM receiver which can receive the information afar and monitor that.
- The indicator light works when it is charging please shutdown in case of damaging the machine. It needs to charge for about five hours. The sounder must smoothly stick to the wall`s surface; never move the sounder when you are sticking it to the wall in case of damaging the sounder. The effect of the monitoring depends on the thickness, materials and other features of the wall. Appropriately adjust the gear-choice button until you can get the best effect of monitoring. D is the partition monitor

## Product Details

- **Brand:** hotsell999
- **Connectivity Technology:** Wired
- **Color:** Silver
- **Compatible Devices:** Headphone, Headset
- **Mounting Type:** Wall Mount

## Images

![New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) - Image 1](https://m.media-amazon.com/images/I/41s7-xEAeWL.jpg)
![New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) - Image 2](https://m.media-amazon.com/images/I/41VTCBmP2JL.jpg)
![New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) - Image 3](https://m.media-amazon.com/images/I/41s-zageIGL.jpg)
![New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) - Image 4](https://m.media-amazon.com/images/I/41jicrg3eYL.jpg)
![New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years) - Image 5](https://m.media-amazon.com/images/I/414v8xqcNJL.jpg)

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**Shop now:** [https://www.desertcart.gr/products/129380857-new-f999b-super-sensitive-listen-thru-wall-contact-probe-microphone](https://www.desertcart.gr/products/129380857-new-f999b-super-sensitive-listen-thru-wall-contact-probe-microphone)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-01-27*