---
product_id: 17096653
title: "Velleman MiniKits MK120 IR Light Barrier"
brand: "velleman"
price: "$7.37"
currency: USD
in_stock: true
reviews_count: 12
url: https://www.desertcart.ec/products/17096653-velleman-minikits-mk120-ir-light-barrier
store_origin: EC
region: Ecuador
---

# 4m max detection range 85 dB audible alert 9V battery & adapter included Velleman MiniKits MK120 IR Light Barrier

**Brand:** velleman
**Price:** $7.37
**Availability:** ✅ In Stock

## Summary

> 🚨 Secure your space with invisible tech that speaks volumes!

## Quick Answers

- **What is this?** Velleman MiniKits MK120 IR Light Barrier by velleman
- **How much does it cost?** $7.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/17096653-velleman-minikits-mk120-ir-light-barrier)

## Best For

- velleman enthusiasts

## Why This Product

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

## Key Features

- • **Dual Alert System:** Get instant notifications with both a loud 85 dB buzzer and a bright LED indicator.
- • **Plug & Play Power:** Includes 9V battery holder and adapter jack for hassle-free setup and continuous operation.
- • **User-Friendly Control:** On/off switch lets you activate protection only when you need it—no wasted power.
- • **Versatile Applications:** Ideal for home security, visitor alerts, science projects, or even quirky pet boundaries.
- • **Invisible Security Perimeter:** Set up a discreet IR barrier up to 4 meters—perfect for smart boundary control.

## Overview

The Velleman MiniKits MK120 IR Light Barrier is a compact infrared sensor system designed to create an invisible detection line up to 4 meters. It triggers a loud 85 dB audible alarm and a visible LED alert when the beam is interrupted. Powered by a 9V battery (holder and adapter included) and featuring an easy on/off switch, it’s perfect for home security, visitor notifications, or experimental projects.

## Description

Velleman IR light barrier can be used to announce visitors, warn against burglars, set boundaries, science projects and more. It produces an audible (85 dB) and visible (LED) alert. It can cover a range of 1 m to 4 m. An on/off switch is provided. The power supply required for the transmitter is 9 vdc/50 mA maximum and for the receiver is 9 vdc/20 mA maximum. A 9 V battery holder and an adapter jack are included.

Review: Freaked out the cat - It was pretty cool. I basically just wanted to get more practice with soldering, but once I made it, I thought it would be funny to see how the cats reacted. I placed it near a doorway they usually go through. They freaked out at first, but eventually figured out what was making the noise, and then started stepping over the invisible line. LOL.
Review: Five Stars - OK!

## Features

- Applications includes warn Against burglars, set boundaries, science projects and more
- produces an audible and visible Alert
- 9 V battery holder and an adapter jack are Included
- Includes an on/off switch

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00SNH22RQ |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #1,653,224 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,547 in Oscilloscopes & Accessories |
| Control Method | Touch |
| Customer Reviews | 3.9 3.9 out of 5 stars (54) |
| Date First Available | January 1, 2004 |
| Description Pile | Alkaline |
| Global Trade Identification Number | 05410329333010 |
| Included Components | 1 x Velleman IR Light Barrier |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 2.22 ounces |
| Item model number | MK120 |
| Manufacturer | Velleman |
| Maximum Range | 4 Meters |
| Measurement System | Metric |
| Mounting Type | Tabletop Mount |
| Noise Level | 85 Decibels |
| Number Of Pieces | 1 |
| Part Number | MK120 |
| Plug Format | No plug |
| Product Dimensions | 0.98 x 4.76 x 7.87 inches |
| Sensor Technology | Infrared |
| Volume | 75 Cubic Centimeters |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** Velleman
- **Color:** Multi-colour
- **Power Source:** Battery Powered
- **Voltage:** 9 Volts

## Images

![Velleman MiniKits MK120 IR Light Barrier - Image 1](https://m.media-amazon.com/images/I/515KWxtq2IL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Freaked out the cat
*by J***R on February 6, 2014*

It was pretty cool. I basically just wanted to get more practice with soldering, but once I made it, I thought it would be funny to see how the cats reacted. I placed it near a doorway they usually go through. They freaked out at first, but eventually figured out what was making the noise, and then started stepping over the invisible line. LOL.

### ⭐⭐⭐⭐⭐ Five Stars
*by W***W on September 5, 2014*

OK!

### ⭐⭐⭐ It's Okay...for a toy.
*by K***R on April 17, 2013*

Works fine for a toy but could not work in a real enviroment. Battery life is VERY short. Works for a demonstration but for sustained use it is not suited.

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**Shop now:** [https://www.desertcart.ec/products/17096653-velleman-minikits-mk120-ir-light-barrier](https://www.desertcart.ec/products/17096653-velleman-minikits-mk120-ir-light-barrier)

---

*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-03-01*