# Door magnetic contact sensor BLOW 4923# HO-03L brown

**URL:** https://aio.lv/en/product--blow-4923--11863753
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Smart Sensors
**Manufacturer:** BLOW
**Manufacturer code:** 4923#
**EAN:** 5900804099031
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.49 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 5.36 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blow-4923--11863753

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.99 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

Wired door magnetic contact sensor by BLOW, model 4923# (HO-03L) in brown. Designed to detect door or window open/close state via a reed switch (kontaktron), suitable for use with alarm systems and access control panels. Compact form factor for surface mounting on frames, used to trigger alerts, automation, or security monitoring.

## Long description

Wired door magnetic contact sensor BLOW 4923# HO-03L in brown is a compact reed-switch sensor designed to monitor the open/closed state of doors and windows. Intended for surface mounting on frames, the sensor provides a simple electrical contact change when the magnet moves away from or toward the sensor body. It is compatible with alarm systems and access control panels that accept wired magnetic contacts and is suitable for triggering alerts, automation scenarios, or security monitoring.
Advantages
The BLOW HO-03L contact sensor features a compact housing and low-profile design that fits discreetly on most door and window frames. Its wired connection ensures reliable signal transmission without dependence on batteries. The reed-switch mechanism provides straightforward on/off state detection with minimal maintenance requirements. The brown finish allows the device to blend with darker frames or interiors where visual discretion is preferred.
Suitable for
 Monitoring interior and exterior doors in homes or small offices
 Window open/close detection for security systems
 Integration with alarm panels and access control systems
 Triggering automation events such as lighting or notification when a door opens
Key specifications
 Type: Wired magnetic contact sensor with reed switch
 Mounting: Surface mount on door or window frames
 Color: Brown
 Housing: Compact, low-profile design suitable for discreet installation
 Operation: Detects proximity of a magnet to indicate open/closed state
 Connection: Hardwired electrical terminals for integration with control panels
How to use
Install the sensor body on the stationary part of the frame and align the magnet on the moving part (door or window) so that the two elements are opposite when the door is closed. Secure both parts with screws or appropriate adhesive according to the mounting surface, ensuring consistent alignment across the full range of motion. Connect the sensor wires to the alarm or access control input following the system wiring diagram and verify the correct normally closed (NC) or normally open (NO) behavior required by your panel. Test the sensor by opening and closing the door or window and confirming the control panel registers state changes.
Usage recommendations
 Use the sensor in dry indoor or sheltered outdoor locations to avoid direct prolonged exposure to moisture. Maintain correct alignment between the magnet and sensor body to ensure reliable operation; if wiring passes through door or window frames, use strain relief to protect connections. If the control panel requires supervision or end-of-line resistors, install those components according to the panel manufacturer’s instructions.

## FAQ

### How much does the Door magnetic contact sensor BLOW 4923# HO-03L cost, and is it available for purchase?

The price is 6.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 19 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All BLOW products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized BLOW service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11863753/67262427_large.webp