Terms and conditions

As of 30 October 2026

1. Scope

These terms apply to all orders in our online shop at sunmatched.com.

The seller is Dunkel Engineering, a sole proprietorship of Christoph Dunkel, Weiermattweg 30, 4452 Itingen, Switzerland. Email: info@dunkel-engineering.ch, phone: +41 78 713 88 90. In these terms, "we" and "us" mean the seller, and "you" means the customer.

We sell to consumers and to business customers. A consumer is a person who buys for personal or family use, not mainly for their trade, business or profession. Some rules apply only to consumers. We say so where this is the case.

Dealers buy under separate terms that we agree with each dealer.

Terms and conditions of business customers apply only if we have agreed to them in writing.

Your order is governed by the version of these terms that is valid when you place it.

2. Delivery area

We deliver only to addresses in Switzerland and Liechtenstein. If you would like a delivery to another country, please ask us at hello@sunmatched.com.

3. Products

We sell the room climate sensors Sunmatched Climate (temperature and humidity) and Sunmatched Climate Pro (temperature, humidity and air pressure). They run on light: an indoor solar cell charges a lithium-ion capacitor, which stores the energy. They contain no battery. A USB-C input (5 V) lets you top them up. They connect by Bluetooth Low Energy and, depending on the mode you choose in the app, by Zigbee or Thread. The product pages describe the main characteristics, including the supported smart-home systems.

The sensors are made for monitoring the indoor climate. They are not safety devices. Do not rely on them alone where a failure or a wrong reading could lead to injury or major damage, for example for frost protection, fire detection or medical purposes.

Pioneer batch

The sensors we sell at present come from our first production batch (pioneer batch). The hardware is final. We keep improving the firmware and deliver the improvements as signed over-the-air updates, which you install with our app. Data from several years of use in real homes is still being collected. This does not limit your statutory warranty rights. You can read more on our page "Warranty".

Functions marked "beta"

Some functions are marked "beta", at present the Matter over Thread mode. Beta functions are still being developed. They can contain errors, may not work with every smart-home system and can change with firmware updates. Please base your purchase decision on the functions that are not marked beta. This does not limit your statutory warranty rights.

4. Prices and discounts

Our prices are final prices in Swiss francs (CHF). Not registered for VAT (turnover below CHF 100,000): no VAT is charged.

Shipping costs are added to the prices. They are the actual Swiss Post postage for your shipment, rounded up to the next CHF 0.10. The checkout shows them before you order. You find the details on our page "Shipping and payment".

You pay no customs duties or import taxes on delivery: we ship from Switzerland, and Liechtenstein belongs to the Swiss customs area.

Volume discounts

All sensors in one order count, in any mix of models. The discount is deducted automatically in the cart and shown before you order. It does not apply to shipping costs.

5. How the contract is concluded

The products in our shop are not a binding offer by us. They invite you to place an order.

1. Put the products you want in the cart. There you can change quantities or remove products.
2. Go to the checkout. Enter your email address and delivery address, choose a shipping method and choose how you want to pay.
3. Check the summary: products, quantities, discounts, shipping costs, total price and expected delivery time. Until you place the order, you can correct all entries, for example in the fields of the checkout or by going back to the cart.
4. Accept these terms and click the button "Buy now". With this click, you place a binding order.
5. If you pay by card, Apple Pay, Google Pay or TWINT, you then complete the payment on the secure payment page of our payment service provider.

The contract is concluded when we confirm your order by email (order confirmation). We send the order confirmation:

• right after the successful payment, if you pay by card, Apple Pay, Google Pay or TWINT;
• right after you place the order, if you pay by bank transfer.

If the payment fails or you cancel it, no contract is concluded and nothing is charged. If you do not receive an order confirmation within one day, please check your spam folder and contact us.

You can order in English or in German. The contract language is the language of the shop in which you order. We store your order. The order confirmation contains a link to your order page, where you can view your order. It also contains these terms and our information on returns and withdrawal as text. Please keep it.

6. Payment

You can pay by:

• credit or debit card (Visa, Mastercard), Apple Pay or Google Pay,
• TWINT,
• bank transfer in advance, with a Swiss QR-bill.

Payments by card, Apple Pay, Google Pay and TWINT are processed on the secure payment page of our payment service provider Stripe Payments Europe, Limited. Your card details never reach us. The amount is charged when you complete the payment.

If you pay by bank transfer, our order confirmation contains our bank details and a payment reference. Your order page also shows a QR-bill that you can scan with your banking app. Please pay within 10 days of the order confirmation and use the payment reference. We ship once your payment has arrived. If your payment has not arrived within 10 days, we may cancel the order. We tell you by email. You then owe us nothing, and if your payment arrives after the cancellation, we refund it.

7. Delivery

We ship from Itingen, Switzerland, with Swiss Post. You choose the shipping method in the checkout.

Products in stock leave us within 1–3 working days. This time starts with our order confirmation, or when your payment arrives if you pay by bank transfer. Swiss Post's transit time is added.

Built to order

Our stock is limited. If you order more units than we have in stock, we build the additional units for you. They are ready to ship within 2–4 weeks. The checkout shows this before you order, and we confirm it in the order confirmation. We normally ship the whole order once all units are ready, unless we agree otherwise with you.

Delays

If we cannot keep a delivery time, we tell you as soon as we know and give you a new date. If you do not want to wait, you can cancel the affected products free of charge. We then refund what you paid for them without delay.

Transport damage and risk

If you are a consumer, we bear the risk of loss or damage in transit. The risk passes to you when Swiss Post delivers the shipment to you at your delivery address. This is more favourable to you than the statutory rule (Art. 185 of the Swiss Code of Obligations), under which the risk would generally pass to you as soon as we hand the shipment to Swiss Post.

If you are a business customer, the risk passes to you when we hand the shipment to Swiss Post.

Please check the shipment when it arrives. If it is visibly damaged, tell us as soon as possible, ideally with a photo. This helps us claim from Swiss Post. It does not affect your rights.

8. Returns and right of withdrawal

Swiss law gives no statutory right of withdrawal for online purchases. We therefore give all customers a voluntary right to return products within 30 days of delivery, without giving a reason.

If you are a consumer living in Liechtenstein, you also have a statutory right of withdrawal of 14 days. Our voluntary return right covers this period, and the statutory rules apply in addition.

You can report a return or a withdrawal with our online form at sunmatched.com/legal/withdraw.html or by email. The conditions, the instructions on withdrawal and the model withdrawal form are on our page "Returns" at sunmatched.com/legal/returns.html.

9. Warranty

The statutory warranty for defects under the Swiss Code of Obligations applies. The warranty period is 2 years from delivery. If a product is defective, we repair or replace it free of charge. If this is not possible or does not work, you can ask for a price reduction or return the product and get your money back. We give no separate guarantee. The details are on our page "Warranty" at sunmatched.com/legal/warranty.html.

10. Liability

We are liable without limitation:

• for damage caused intentionally or through gross negligence,
• for injury to life, body or health,
• under the Swiss Product Liability Act,
• in all other cases where the law does not allow liability to be limited.

For slight negligence, we are liable only for direct damage that was typical and foreseeable when the contract was concluded. In this case, we are not liable for indirect or consequential damage, such as lost profit or lost data.

These rules also apply to the liability of the people we use to perform the contract. Your statutory warranty rights are not affected.

11. Complaints and disputes

If something is not right, please contact us first at hello@sunmatched.com. We will look for a solution with you. We are not obliged to take part in proceedings before a consumer arbitration body, and at present we do not take part in such proceedings.

12. Applicable law and place of jurisdiction

Swiss law applies to these terms and to all contracts concluded under them. The UN Convention on Contracts for the International Sale of Goods (CISG) does not apply.

If you are a consumer living in Liechtenstein, you keep the protection of the mandatory consumer protection rules of Liechtenstein.

If you are a consumer, you can take legal action against us at the courts of the place where you live or at the courts of our place of business. We can take legal action against you only at the courts of the place where you live.

If you are a business customer, the courts at our place of business in Itingen, Switzerland, have exclusive jurisdiction. We may also take legal action against you at your place of business.

13. Privacy

Our privacy policy at sunmatched.com/legal/privacy.html explains how we process your personal data.