# Door reed contact sensor BLOW HO-03L 4924# white — magnetic door/window sensor

**URL:** https://aio.lv/en/product--blow-4924--11863675
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Smart Sensors
**Manufacturer:** BLOW
**Manufacturer code:** 4924#
**EAN:** 5900804099024
**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-4924--11863675

## 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 magnetic reed door/window sensor BLOW HO-03L (model 4924#) in white. Designed to detect opening/closing of doors or windows via a magnetic contact switch; suitable for alarm systems, access control and security monitoring. Compact enclosure for surface mounting and simple wiring to control panels or alarm modules.

## Long description

Wired magnetic reed door/window sensor BLOW HO-03L in white is a compact magnetic contact switch designed to detect opening and closing of doors and windows. The sensor consists of a main body and a magnet that create a normally closed or normally open contact depending on installation. It is intended for surface mounting and wired connection to alarm systems, access control panels or other security monitoring equipment where a simple, reliable magnetic contact input is required.
Advantages
The sensor offers a small footprint and discreet appearance for unobtrusive installation on frames and sashes. Its wired design provides a stable, low-latency signal to control panels without the need for batteries, ensuring continuous operation. The device is compatible with standard alarm inputs and requires only basic wiring, which simplifies integration into existing security systems. The durable plastic enclosure resists common mechanical wear associated with door and window movement.
Suitable for
Residential doors and windows for intrusion detection
Commercial access points such as offices and storage rooms
Integration with wired alarm systems and control panels
Perimeter monitoring in retail and small business premises
Key specifications
Type: Wired magnetic reed contact sensor
Color: White
Mounting: Surface mount on door or window frame
Contact type: Magnetic reed switch (normally closed or normally open depending on wiring)
Body material: Rigid plastic enclosure suitable for indoor use
Connection: Two- or three-wire terminal connection for alarm inputs
Sensing method: Magnet proximity activation
How to use
Position the main sensor body on the fixed frame and align the magnet on the moving sash or door so that the two parts meet within the specified gap when closed. Secure both parts with screws or adhesive as appropriate for the surface. Connect the sensor leads to the control panel input following the panel manufacturer’s wiring diagram; select normally closed or normally open configuration according to system requirements. Test the installation by opening and closing the door or window to confirm the control panel registers the change of state.
Usage recommendations
Install the sensor indoors or in sheltered locations to avoid direct exposure to weather. Maintain an appropriate gap between sensor and magnet as specified by the installer’s guide to ensure reliable switching. Route wiring to avoid pinching or sharp bends and secure connections inside the control panel. Periodically inspect mounting and wiring for signs of wear or loosening and retest operation after any maintenance.

## FAQ

### How much does the Door reed contact sensor BLOW HO-03L 4924# 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 — 3 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/11863675/67262325_large.webp