# Smoke detector DAHUA DHI-HY-SA21A-W2(868) photoelectrical reflection, wireless, battery 3 V, Ø98 mm

**URL:** https://aio.lv/en/product--dahua-hy-sa21a-w2868--11417636
**Data updated:** 2026-02-17 11:01 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** DAHUA
**Manufacturer code:** HY-SA21A-W2(868)
**EAN:** 6923172538963
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 55.99 €
**Prices and availability valid until:** 2026-08-13 23:59
**Price without VAT (21%):** 46.27 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--dahua-hy-sa21a-w2868--11417636

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Pickup points | 27.07.2026 | 1.89 EUR |
| Courier delivery to door | 27.07.2026 | 4.99 EUR |

## Summary description

DAHUA DHI-HY-SA21A-W2(868) is a photoelectrical reflection smoke detector with wireless connectivity and battery power. It operates from a 3 V lithium battery and meets EN 14604:2005+AC:2008 standard. Compact and lightweight (Ø98 mm, height 43.1 mm, 140 g), it is designed for indoor early smoke detection in homes or small commercial spaces and is CE certified.

## Long description

DAHUA DHI-HY-SA21A-W2(868) is a photoelectrical reflection smoke detector with wireless connectivity and battery power. The unit uses a photoelectric sensing chamber to detect visible smoke particles and includes wireless transmission compatible with Dahua wireless systems. Powered by a 3 V lithium battery, the compact detector (Ø98 mm, height 43.1 mm, weight 140 g) is designed for indoor early smoke detection in homes and small commercial spaces and complies with EN 14604:2005+AC:2008 and CE certification. The device provides local alarm signaling and can report status and events to supported monitoring apps in real time.
Advantages
The DAHUA photoelectrical sensor offers early detection of smouldering and visible-particle fires while reducing false alarms caused by steam or cooking fumes due to its optical chamber design. Wireless operation and battery power remove the need for mains wiring and make installation flexible. Its compact size and light weight enable unobtrusive placement on ceilings or high walls. Compliance with EN 14604:2005+AC:2008 ensures that the detector meets recognized performance and safety requirements for residential smoke alarms.
Suitable for
 Residential rooms and apartments
 Villas and houses
 Small retail shops and offices
 Hallways, kitchens (away from direct steam), and living areas
Key specifications
 Detection principle: photoelectric (optical) reflection
 Power source: 3 V lithium battery
 Mounting diameter: 98 mm
 Height: 43.1 mm
 Weight: 140 g
 Wireless connectivity: compatible with Dahua wireless alarm network (868 MHz band)
 Standards: EN 14604:2005+AC:2008; CE marked
How to use
Mount the detector on a ceiling or high on a wall following the manufacturer's spacing recommendations and away from ventilation outlets or sources of steam. Insert the 3 V lithium battery and perform the built-in self-test to confirm power and sensor readiness. Pair the detector with the compatible Dahua wireless system or receiver according to the system pairing procedure; after successful pairing, test alarm transmission and local sounder operation. Place detectors in each sleeping area and on each level of the premises to ensure early warning coverage.
Usage recommendations
Regularly test the detector using its test function and replace the battery according to the manufacturer's interval or when low-battery indication is given. Do not paint the detector or block the sensing chamber. Install units away from direct cooking appliances, drafts, or humidifiers to reduce nuisance alarms. Follow local fire-safety codes for detector placement and quantity to achieve appropriate coverage.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.14 kg |
| Certification | EN 14604:2005+AC:2008 |
| Battery technology | Lithium |
| Operating relative humidity (H-H) | 0 - 95 |
| Battery type | CR123A |
| Operating temperature (T-T) | -10 - 55 |
| Power source | Battery |
| Alarm decibels | 90 dB |
| Height | 43.1 mm |
| Input voltage | 3 |
| LED indicators | Power, Fault, Alarm |
| Connectivity technology | Wireless |
| Product colour | White |
| Battery life | 3 year(s) |
| Diameter | 98 mm |
| Maximum range | 1000 m |
| Battery low indication | Yes |
| Housing material | ABS |
| Bandwidth | 868.3 MHz |
| Mounting type | Surface-mounted |
| Detector type | Photoelectrical reflection detector |
| Compatible battery sizes | CR123A |
| Interconnectable | No |
| Light alarm | Yes |
| Alarm mute | Yes |
| Suitable for indoor use | Yes |
| Compliance certificates | CE |

## FAQ

### How much does the Smoke detector DAHUA DHI-HY-SA21A-W2(868) cost, and is it available for purchase?

The price is 55.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 46 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 22.07.2026 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 DAHUA 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 DAHUA 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

### Where can I download the instructions for Smoke detector DAHUA DHI-HY-SA21A-W2(868)?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/11417636/66183498_large.webp