# Ei Electronics Ei428RF Interconnectable Surface-mounted Smoke Alarm 150m RF Range

**URL:** https://aio.lv/en/product--ei-electronics-ei428--11443394
**Data updated:** 2025-12-30 21:21 (EET)
**Category:** Home Goods Accessories
**Manufacturer:** ei electronics
**Manufacturer code:** Ei428
**EAN:** 5099383003826
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 106.49 €
**Prices and availability valid until:** 2026-07-05 23:59
**Price without VAT (21%):** 88.01 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ei-electronics-ei428--11443394

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

The Ei Electronics Ei428RF is a surface-mounted smoke alarm featuring a 150m RF transmission range. It operates on a lithium battery with an input voltage of 230V. The device measures 141mm in width and height, and 26mm in depth. It meets UL 94 V0 flammability standards, ensuring safety and reliability in smoke detection.

## Long description

The Ei Electronics Ei428RF Relay Base is a surface-mounted relay interface designed to switch a relay when it receives an alarm signal from a compatible Ei alarm. It provides electrically isolated contacts for signaling and switching loads such as indicator lights or strobes. The unit is mains powered at 230 VAC and includes rechargeable backup cells to maintain operation during mains failure. By default the relay operates continuously but can be set to pulse mode. The Ei428RF is intended primarily for use with RadioLINK devices but can also integrate with conventional hard-wired interconnect systems. The unit uses FM radio transmission with Manchester coding and built-in circuitry to suppress voltage transients and RF interference.
Advantages
The relay base offers electrically isolated contacts for versatile integration, mains power with rechargeable battery backup for continued operation during outages, selectable continuous or pulse relay operation, and robust RadioLINK communication using frequency modulation and Manchester coding to minimise interference. Built-in suppression circuitry helps protect against voltage transients and RF noise.
Suitable for
Signalling systems (lights, strobes, buzzers)
Integration with RadioLINK interconnect alarm networks
Connection to conventional wired interconnect systems
Places requiring mains-powered relay switching with battery backup
Key specifications
Model: Ei428 (Ei428RF)
Power input: 230 VAC mains with rechargeable battery backup cells
RF range: up to 150 m (specified for RadioLINK transmission)
Dimensions: 141 mm × 141 mm × 26 mm (W × H × D)
Flammability rating: UL 94 V-0
EAN: 5099383003826
How to use
Mount the relay base on a suitable surface and connect to the 230 VAC mains according to local electrical regulations. Pair or link the Ei428RF with compatible Ei RadioLINK alarms following the manufacturer’s pairing procedure, or wire the isolated relay contacts into a conventional interconnect system if required. Configure the relay for continuous or pulse operation as needed. Ensure rechargeable backup cells are installed and charged so the relay base can operate during a mains outage.
Usage recommendations
Install and commission the Ei428RF in accordance with local electrical and fire safety regulations. Test radio range and interconnect behaviour after installation and replace or service batteries and components as recommended by the manufacturer to maintain reliable operation.

## Specifications

| Feature | Value |
|---|---|
| Weight | 0.18 kg |
| Battery technology | Lithium |
| Operating relative humidity (H-H) | 15 - 95 |
| Operating temperature (T-T) | 0 - 40 |
| Height | 141 mm |
| Input voltage | 230 |
| Width | 141 mm |
| Depth | 26 mm |
| Product colour | White |
| RF transmission range | 150 m |
| RF transmission frequency | 868 MHz |
| Mounting type | Surface-mounted |
| Interconnectable | Yes |
| Backup battery | Yes |
| Built-in relay | Yes |
| UL 94 flammability standard | V0 |
| Interconnected alarms quantity (max) | 12 |

## FAQ

### How much does the Smoke Alarm Ei Electronics Ei428RF cost, and is it available for purchase?

The price is 106.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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 07.07.2026 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. 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 ei electronics 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 ei electronics 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

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