---
product_id: 942518
title: "Ademco 5820L | Honeywell 5820L Wireless Slimline Contact"
brand: "honeywell"
price: "€ 98.00"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.fi/products/942518-ademco-5820l-honeywell-5820l-wireless-slimline-contact
store_origin: FI
region: Finland
---

# Wireless Connectivity Long Battery Life Enhanced Security Ademco 5820L | Honeywell 5820L Wireless Slimline Contact

**Brand:** honeywell
**Price:** € 98.00
**Availability:** ✅ In Stock

## Summary

> 🔐 Secure Your Space, Simplify Your Life!

## Quick Answers

- **What is this?** Ademco 5820L | Honeywell 5820L Wireless Slimline Contact by honeywell
- **How much does it cost?** € 98.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/942518-ademco-5820l-honeywell-5820l-wireless-slimline-contact)

## Best For

- honeywell enthusiasts

## Why This Product

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

## Key Features

- • **Sleek Design:** Ultra-slim profile that blends effortlessly into any decor.
- • **Extended Range:** Reliable performance with a long wireless range for maximum coverage.
- • **Easy Installation:** No complicated setup—just peel, stick, and secure your peace of mind.
- • **Low Battery Alerts:** Stay informed with timely notifications to ensure uninterrupted security.
- • **Seamless Integration:** Easily connects with your existing security system.

## Overview

The Ademco 5820L by Honeywell is a wireless slimline contact sensor designed for easy integration into your home security system. With its sleek design, long battery life, and reliable performance, it ensures your property remains protected without compromising on aesthetics.

## Description

Ademco 5820L | Honeywell 5820L Wireless Slimline Contact OPEN BOX

## Features

- Ademco 5820L | Honeywell 5820L Wireless Slimline Contact OPEN BOX

## Product Details

- **Compatible Devices:** Desktop, Laptop
- **Power Source:** Battery Powered
- **Brand:** Honeywell
- **Connectivity Technology:** USB Cable
- **Number of Batteries:** 1 AAA batteries required.

## Images

![Ademco 5820L | Honeywell 5820L Wireless Slimline Contact - Image 1](https://m.media-amazon.com/images/I/21vlOCAtLIL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great little sensor!
*by J***H on March 27, 2016*

When we bought our house, the previous owner hadn't kept the security system maintained. Several doors had contact sensors hanging off the frames, and a few wires were pushed up into the doorframe. I've been resurrecting the complete security system over the last week or so, but I didn't want to take the door trim off, fish out the wires, re-hang the trim, etc, etc. These slimline wireless sensors aren't *that* much larger than the wired versions. Yes, they're larger. Yes, they're a little more noticeable. But they're wireless and allowed me to fix the couple of doors where the wires had gone bad without taking my walls apart. That's worth it, in my book.I installed my own panel, so I had my panel's master codes. To add these to your system, you will either need to contact your installer, or you will need to have the installers codes to program the panel (and the know-how to use them) yourself. If you're reasonably experienced with "Do it yourself" projects, this is not difficult. It took me about 30 minutes of research online to figure out how all consumer-grade security panels work and about an hour of reading the programming manuals to work out how to program mine.The honeywell panel (with the newer keypads) makes adding these into the system a breeze. You just set the zone type, tell the panel it's an RF sensor, and then separate the magnet and transmitter a couple of times to auto-enter the serial number. From that point on, it "just works". You should make sure to test your sensors in the location you want to install them before you tape or screw them to your door, but I have a rather large house, and these worked fine when the receiver (my RF keypad) was on the first floor on one side of the house, and the sensor was in the basement on the opposite side of the house. I live in a pretty remote area, though, with almost no RF interference, so your milage may vary.Bottom line, I love these sensors, and I'll buy them again as I need more.

### ⭐⭐⭐⭐⭐ These work well on double pane windows using rare earth magnets.
*by 1***1 on February 11, 2016*

I've had 3 of these develop what appear to be tamper switch problems (i.e., the tamper switch triggers an alarm when there is no tampering. I fixed this by putting 1 or 2 layers of tape on the ridge the keeps the tamper switch down. .I use these on my PVC double pane windows sills. I glue rare earth magnets to the top pane and stick this thing on the lower pane (and ditch the magnet it came with) so that it alarms no matter which part of the window gets opened.They are pricey, but they look much better than the bigger ones. Plus, these don't require me to drill into my new vinyl windows.

### ⭐⭐⭐ High failure rate
*by C***N on April 13, 2021*

These fail a lot. I have had to replace several. Some have lasted a long time. Others, just a few months. Too expensive to keep risking that. The security company I am using said they no longer use these because of the high failure rate. Too bad, because the slim size makes them almost unnoticeable. But, if I can’t count on them, what’s the point in having a security system?

## Frequently Bought Together

- Ademco 5820L | Honeywell 5820L Wireless Slimline Contact
- Honeywell Ademco 5816WMWH White Door/Window Transmitter w/Magnet
- Honeywell 6160RF Custom Alpha Integrated Keyboard/Transeiver

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**Shop now:** [https://www.desertcart.fi/products/942518-ademco-5820l-honeywell-5820l-wireless-slimline-contact](https://www.desertcart.fi/products/942518-ademco-5820l-honeywell-5820l-wireless-slimline-contact)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-16*