# Indoor/outdoor thermometer-hygrometer TFA Horizon Black wireless 433 MHz, AAA 1.5V, 158×123×26 mm

**URL:** https://aio.lv/en/product--tfa-35115501--6068764
**Data updated:** 2026-03-07 15:15 (EET)
**Category:** Weather Station
**Manufacturer:** TFA
**Manufacturer code:** 35.1155.01
**EAN:** 4009816034281
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 38.99 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 32.22 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tfa-35115501--6068764

## 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

TFA Horizon Black is a wireless indoor/outdoor thermometer and hygrometer with trend display for temperature and humidity. Measures indoor humidity and temperature plus outdoor temperature via 433 MHz transmission. Powered by AAA/AA 1.5 V batteries. Compact dimensions (158×123×26 mm) make it suitable for home, office or greenhouse monitoring.

## Long description

TFA Horizon Black is a wireless indoor/outdoor thermometer-hygrometer that displays temperature and humidity trends and provides additional environmental information for home, office or greenhouse monitoring. The device measures indoor temperature and humidity and receives outdoor temperature via a 433 MHz radio transmitter. A built-in electronic barometer tracks air pressure and displays a weather symbol based on pressure changes; a bar chart shows air pressure history for the last 12 hours. The unit accepts AAA/AA 1.5 V batteries and has compact dimensions of 158×123×26 mm. The display also shows moon phase and sunrise/sunset times, and time and date are updated via the DCF77 atomic clock signal. The instrument includes alarm clock functions with two wake-up alarms and snooze, and a blue backlight that can be switched on with a button.
Advantages
TFA Horizon Black combines indoor humidity and temperature measurement with wireless outdoor temperature reception on 433 MHz, allowing coordinated monitoring of living climate and external conditions. The integrated electronic barometer and 12-hour pressure history chart support short-term weather forecasting with clear weather symbols. Compact size and battery operation make the unit flexible to install where needed, while DCF77 time synchronisation and dual alarms add everyday convenience. The front panel backlight improves display readability in low light.
Suitable for
Home rooms for tracking indoor climate and receiving outdoor temperature
Office spaces where compact monitoring of temperature, humidity and pressure is needed
Greenhouses and plant rooms where humidity and temperature trends are important
Cellars or secondary rooms when additional optional transmitters are used
Key specifications
Functions: indoor temperature, indoor humidity, outdoor temperature (via wireless transmitter), barometer with weather symbol, pressure history chart, moon phase, sunrise/sunset times, time and date display, dual alarm with snooze, backlight
Wireless transmission frequency for outdoor sensor: 433 MHz
Power supply: AAA/AA 1.5 V batteries (battery type supported)
Dimensions: 158 × 123 × 26 mm
Pressure history span: 12 hours (bar chart)
How to use
Place the main unit in a central indoor location within radio range of the outdoor transmitter. Insert the required AAA/AA 1.5 V batteries into the main unit and into the outdoor transmitter following manufacturer polarity markings. The device will receive outdoor temperature readings via the 433 MHz link and update indoor measurements continuously; pressure readings and the 12-hour chart update automatically. Time and date are synchronised via the DCF77 signal when available. Use the front panel buttons to view trend information, switch the blue backlight on, set the two wake-up alarms and activate the snooze function.
Usage recommendations
For reliable outdoor temperature reception, position the external transmitter in a sheltered location away from direct sunlight and heavy precipitation, and keep it within the recommended radio range of the main unit. Replace batteries in both the main unit and transmitter at regular intervals to ensure continuous measurements and time synchronisation.

## Specifications

### Packaging data

| Feature | Value |
|---|---|
| Battery included | No |
| Outdoor sensor | Yes |

### Display

| Feature | Value |
|---|---|
| Backlight display | Yes |
| Built-in display | Yes |

### Ports & interfaces

| Feature | Value |
|---|---|
| Connectivity technology | Wireless |
| Transmission frequency | 433 GHz |

### Features

| Feature | Value |
|---|---|
| Product colour | Black |
| Snooze function | Yes |
| Alarm clock | Yes |
| Housing material | Plastic |
| Temperature measurement range (inside) (T-T) | 0 - 50 |
| Temperature measurement range (inside) (T-T) | 32 - 122 |
| Temperature measurement range (outside) (T-T) | -20 - 60 |
| Temperature measurement range (outside) (T-T) | -4 - 140 |
| Number of sensors supported (max) | 3 |
| Min/Max temperature memory | Yes |
| Alarm function | Yes |
| Clock function | Yes |
| Clock/Date display | Yes |
| Measuring functions | Indoor hygrometer, Indoor thermometer, Outdoor thermometer |
| Outdoor sensors range | 60 m |
| Moon phase | Yes |
| Sunrise/sunset time | Yes |
| Measuring functions trend display | Hygrometer, Thermometer |
| Humidity measuring range (inside) (H-H) | 20 - 95 |

### Power

| Feature | Value |
|---|---|
| Battery type | AAA/AA |
| Power source | Battery |
| Battery voltage | 1.5 V |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.224 kg |
| Height | 123 mm |
| Width | 158 mm |
| Depth | 26 mm |

## FAQ

### How much does the TFA Horizon Black thermometer-hygrometer cost, and is it available for purchase?

The price is 38.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 7 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 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

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

When making a choice, we recommend paying attention to the key features: temperature measurement range (inside) (t-t), temperature measurement range (outside) (t-t), alarm function, weight, clock function, built-in display, 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/6068764/59404848_large.webp