# Door magnetic contact sensor BLOW 4927# HO-03G white, reed switch door/window sensor

**URL:** https://aio.lv/en/product--blow-4927--11863443
**Data updated:** 2026-03-09 17:40 (EET)
**Category:** Smart Sensors
**Manufacturer:** BLOW
**Manufacturer code:** 4927#
**EAN:** 5900804098997
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--blow-4927--11863443

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.99 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

Wired door/window magnetic contact sensor BLOW 4927# (HO-03G) in white. A reed switch style contact sensor designed to detect opening or closing of doors and windows. Includes two parts: sensor body and magnet; suitable for use in alarm systems, access control, and intrusion detection where a simple magnetic contact is required.

## Long description

Wired door/window magnetic contact sensor BLOW 4927# HO-03G in white is a two-part reed switch sensor that detects the opening and closing of doors and windows. The compact sensor body contains a magnetic reed switch and is paired with a separate magnet; when the magnet moves away, the circuit changes state to signal an open or closed condition. Designed for integration into wired alarm systems and access control installations, this reed switch sensor provides a simple and reliable method for monitoring entry points.
Advantages
The BLOW reed switch sensor offers a straightforward wired connection that is compatible with a wide range of control panels and alarm devices. Its compact white housing enables discreet installation on door and window frames. The mechanical reed switch design delivers low power consumption and a stable contact signal with minimal electronic complexity. Installation requires only basic tools and standard wiring practices, making it practical for both professional installers and experienced DIY users.
Suitable for
Wired burglar alarm systems for perimeter protection
Access control systems for door state monitoring
Intrusion detection on windows, doors, cabinets or gates
Remote monitoring setups where a dry contact input is required
Key specifications
Sensor type: reed switch magnetic contact
Configuration: two-part sensor body and magnet
Mounting: surface mount on door or window frame
Connection: wired contacts for dry contact input
Operating state: detects open/closed positions based on magnet proximity
Housing color: white
How to use
Position the sensor body on the fixed frame and align the magnet on the moving part of the door or window so that both parts are adjacent when closed. Secure each part with screws or adhesive according to the surface material and application. Connect the sensor’s wired contacts to the alarm panel or control unit input configured for normally closed or normally open operation as required by the system. Test the installation by opening and closing the door or window to confirm that the control panel registers the state changes correctly.
Usage recommendations
For reliable operation, mount the sensor on clean, dry surfaces and maintain the recommended gap between the sensor body and magnet—typically a few millimetres—so the reed switch changes state consistently. Route wiring to avoid sharp bends, mechanical stress, or exposure to moisture. If used outdoors or in high-humidity environments, protect connections and the sensor with appropriate sealing or enclosures. Verify compatibility with the control panel input type (NC/NO) before final wiring.

## FAQ

### How much does the Door magnetic contact sensor BLOW 4927# HO-03G cost, and is it available for purchase?

The price is 5.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 12 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 15.07.2026 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/11863443/67261972_large.webp