---
product_id: 129380857
title: "New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years)"
brand: "hotsell999"
price: "€ 286.58"
currency: EUR
in_stock: true
category: "Hotsell999"
url: https://www.desertcart.com.cy/products/129380857-new-f999b-super-sensitive-listen-thru-wall-contact-probe-microphone
store_origin: CY
region: Cyprus
---

# 4-channel FM wireless transmission 2000x audio amplification 100h continuous battery life New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years)

**Brand:** hotsell999
**Price:** € 286.58
**Availability:** ✅ In Stock

## Summary

> 🔍 Unlock the unseen — listen beyond walls like a pro!

## 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?** € 286.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/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

- • **All-Day Surveillance Power:** Built-in 3.7V lithium battery delivers up to 100 hours of uninterrupted monitoring.
- • **Portable & Professional Kit:** Includes metal carry case, probe mic, headphones, and recording cable for on-the-go precision.
- • **Ultra-Sensitive Audio Detection:** Hear every whisper through walls with -70dB sensitivity and 2000x amplification.
- • **Seamless Wireless FM Transmission:** Monitor remotely with integrated FM emitter and receiver for hands-free operation.
- • **Versatile Multi-Channel Monitoring:** Switch seamlessly between 4 frequency channels (200MHz to 1200MHz) for crystal-clear sound.

## Overview

The F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System is a professional-grade audio surveillance tool featuring ultra-sensitive -70dB sound detection, up to 2000x amplification, and a robust 3.7V lithium battery enabling 100 hours of continuous use. It supports four selectable frequency channels with wireless FM transmission for remote monitoring. Designed for diverse wall materials, it comes complete with a metal carry case, probe microphone, headphones, and recording accessories, making it ideal for discreet, high-precision audio monitoring.

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07MVZSR1P |
| Audio Input | 3.5mm Audio Cable, Wireless FM Emission |
| Best Sellers Rank | #1,396 in Home Security Systems |
| Connector Type | 3.5mm, Charging |
| Customer Reviews | 1.0 1.0 out of 5 stars (1) |
| Date First Available | January 16, 2019 |
| Is Discontinued By Manufacturer | No |
| Manufacturer | 754914036401 |
| Number of Channels | 4 |
| Power Source | Battery Powered |
| UPC | 754914036401 |

## Product Details

- **Brand:** hotsell999
- **Color:** Silver
- **Compatible Devices:** Headphone, Headset
- **Connectivity Technology:** Wired
- **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)

## Frequently Bought Together

- hotsell999 New F999B Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Warranty Period of Five Years)
- Podoy Bird Observing Listening Recording Device, Listening Device, Electronic Digital Device Sound Amplifier, Digital Recording Device Include Headphone, Visible Range Upto 300ft Long Range
- RAMWANS Enhanced Version Super Sensitive Listen Thru-Wall Contact/Probe Microphone Amplifier System (Enhanced Version Super Sensitive Probe Microphone) (Enhanced Sensitive Microphone)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

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

---

*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-09*