# Wireless Thermo-Hygro Sensor TFA ID-A4 (model 30.3905.02) white — temperature and humidity transmitter

**URL:** https://aio.lv/en/product--tfa-30390502--11677044
**Data updated:** 2026-02-16 07:08 (EET)
**Category:** Weather Station
**Manufacturer:** TFA
**Manufacturer code:** 30.3905.02
**EAN:** 4009816042392
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 37.99 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 31.40 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tfa-30390502--11677044

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

TFA ID-A4 (30.3905.02) is a white wireless thermo-hygro sender from TFA that transmits ambient temperature and relative humidity to compatible receivers. Designed for use with weather stations or indoor monitoring systems, it provides continuous remote sensing of climatic conditions. Its compact housing suits indoor or sheltered outdoor placement and simplifies monitoring and control tasks.

## Long description

TFA ID-A4 (model 30.3905.02) is a white wireless thermo-hygro sensor designed to transmit ambient temperature and relative humidity readings to compatible receivers and weather stations. The compact transmitter housing is suitable for indoor use or sheltered outdoor locations and enables continuous remote monitoring of climatic conditions. It pairs with supported TFA display units and monitoring systems to provide real-time environmental data for home, office, greenhouse or storage spaces.
Advantages
The sensor offers wireless transmission of both temperature and humidity, allowing placement away from the main display unit for more representative readings. Its compact white enclosure supports unobtrusive installation and straightforward integration with compatible weather stations. Low power consumption ensures long battery life, while reliable sensing components maintain stable measurements suitable for monitoring and comparison over time.
Suitable for
 Indoor climate monitoring in living rooms, bedrooms and offices
 Supplementing a weather station with an additional outdoor-sheltered sensor
 Monitoring humidity-sensitive storage areas, cabinets or cellars
 Greenhouse or conservatory environment control when placed in sheltered positions
Key specifications
 Measured parameters: ambient temperature and relative humidity
 Wireless transmission to compatible receivers; typical indoor range depends on environment
 Compact, white plastic housing suitable for wall mounting or placement on flat surfaces
 Battery-powered operation with low power consumption for extended battery life
 Operating placement: indoor or sheltered outdoor locations (avoid direct exposure to rain)
How to use
Install batteries according to the device instructions and place the sensor within the wireless range of the compatible receiver or weather station. Position the unit away from direct heat sources, strong sunlight and direct water exposure to ensure accurate temperature and humidity readings. Follow the pairing procedure of your TFA receiver: typically this involves setting the receiver to search mode and activating the sensor to transmit its ID. After successful pairing, verify readings on the receiver display and relocate the sensor if needed to obtain representative measurements for the monitored area.
Usage recommendations
For accurate and stable data, mount the sensor at typical breathing height for indoor monitoring (about 1.2–1.8 m) and avoid placing it next to heaters, air conditioners or open windows. In sheltered outdoor use, choose a covered location protected from direct rain and sun. Replace batteries when the receiver indicates low power and periodically clean the housing to prevent dust accumulation that could affect humidity readings.

## FAQ

### How much does the TFA ID-A4 thermo-hygro sensor 30.3905.02 cost, and is it available for purchase?

The price is 37.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 8 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 09.07.2026 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 TFA 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 TFA 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/11677044/68542526_large.webp