# Light injector EFB Elektronik 399900.2

**URL:** https://aio.lv/en/product--efb-elektronik-3999002--2124641
**Data updated:** 2026-01-06 11:08 (EET)
**Category:** Network Tools
**Manufacturer:** EFB Elektronik
**Manufacturer code:** 399900.2
**EAN:** 4049759210816
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 64.99 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 53.71 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--efb-elektronik-3999002--2124641

## 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

The EFB Elektronik 399900.2 is a reliable light injector designed for transmission testing. It supports various connectors including LC, MPO/MTP, SC, and ST. Powered by AAA batteries, its compact dimensions (113 mm x 34 mm x 20 mm) make it portable and easy to use. Ideal for network professionals, it ensures efficient testing and maintenance of fiber optic networks.

## Long description

The EFB Elektronik 399900.2 light injector is a compact visual fault locator designed for field, industrial and laboratory fiber optic applications. It emits visible red light in the 630–670 nm range to help locate breaks and faults in singlemode and multimode fiber cables. The unit supports common ferrule sizes and connector types and is supplied with a dust cover and adapters; batteries are not included.
Advantages
The device provides a visible red light source for quick detection of fiber faults up to a range of approximately 6 km. Its small size and support for multiple connector ferrules (2.5 mm: DIN, E2000®, FC, SC, ST; 1.25 mm: LC) make it versatile for a variety of test and maintenance tasks. The injector is suitable for both laboratory and on-site troubleshooting and patching.
Suitable for
Testing singlemode and multimode fiber optic cables
Locating breaks and faults in fiber runs
Identifying and patching individual fibers in bundles or panels
Field testing, industrial maintenance, and laboratory verification
Key specifications
Manufacturer: EFB Elektronik
Model / MPN: 399900.2
Wavelength: 630–670 nm (visible red)
Maximum range: up to 6 km (approx.)
Supported ferrules/connectors: 2.5 mm (DIN, E2000®, FC, SC, ST); 1.25 mm (LC)
Dimensions: 113 mm x 34 mm x 20 mm
Power: AAA batteries (not included)
Included accessories: dust cover, adapter for LC, SC and FC
EAN: 4049759210816
How to use
Install the required AAA batteries, attach the appropriate adapter or connector to match the fiber under test, and switch on the unit to emit visible red light. Connect the injector to the fiber endface and observe the light to locate breaks, bad splices, or identify individual fibers. For long runs, verify the visibility by inspecting intermediate connection points and use the dust cover when the device is not in use.
Usage recommendations
Do not look directly into the light source. Use compatible adapters to avoid damaging connector endfaces and always keep the dust cover on when storing the unit. Replace batteries before long test sessions to ensure consistent output.

## Specifications

| Feature | Value |
|---|---|
| Storage temperature (T-T) | -20 - 70 |
| Battery type | AAA |
| Operating temperature (T-T) | -10 - 50 |
| Number of batteries supported | 2 |
| Power LED | Yes |
| Built-in display | No |
| Test type | Transmission testing |
| Supported connectors | SC, ST, MPO/MTP, LC |
| Wavelength range | 630 - 670 |

### Technical details

| Feature | Value |
|---|---|
| Product colour | Blue |
| Product type | Light injector |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.1 kg |
| Height | 20 mm |
| Width | 113 mm |
| Depth | 34 mm |

## FAQ

### How much does the Light injector EFB Elektronik 399900.2 cost, and is it available for purchase?

The price is 64.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 96 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. 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 EFB Elektronik 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 EFB Elektronik 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: product type, weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/2124641/64199760_large.webp