Terms of service

Terms and conditions

Translation for convenience; the German version is authoritative.

§ 1 Scope and seller

(1) These terms apply to all orders placed through the online shop kepler.watch.

(2) The seller and contracting party is ZAM Labs UG (haftungsbeschränkt), registered in the commercial register of the Amtsgericht München under HRB 317339, represented by its managing director Sebastian Alexander Mück, Schellingstraße 87, 80799 München, Germany, email: support@kepler.watch ("we"). Kepler Watch is a brand of ZAM Labs UG (haftungsbeschränkt).

(3) A consumer is any natural person who enters into a legal transaction for purposes that are predominantly outside their trade, business or profession (§ 13 BGB).

§ 2 Conclusion of the contract

(1) The presentation of products in the shop is not a legally binding offer but an invitation to order.

(2) By submitting your order with the button at the end of the checkout, you make a binding offer to buy the goods in your cart. You can review and correct your details at any time before submitting.

(3) We confirm receipt of your order immediately by email. The purchase contract is concluded with this order confirmation.

(4) The contract language is German. We store the contract text. You receive the order details and the withdrawal notice with the order confirmation email. You can view, save and print these terms at any time at kepler.watch/policies/terms-of-service.

§ 3 Prices and shipping costs

(1) All prices are final prices. No VAT is charged under § 19 UStG.

(2) Shipping costs are added. They are listed on the Shipping & delivery page and shown before you complete your order.

§ 4 Payment

The available payment methods are shown during checkout. If you pay through a payment service (e.g. PayPal or Shopify Payments), its terms apply in addition.

§ 5 Delivery

(1) We deliver to addresses in the European Union, currently not to Luxembourg or Cyprus.

(2) We ship once a week, by the Saturday after we receive your order at the latest. Delivery times are listed on the Shipping & delivery page.

(3) If an ordered product is unexpectedly unavailable, we will inform you without delay and refund any payments already made.

§ 6 Retention of title

The goods remain our property until paid in full.

§ 7 Right of withdrawal

Consumers have a statutory right of withdrawal. Details are in the withdrawal notice on the Right of withdrawal, returns & warranty page. The model withdrawal form and the online withdrawal function are at kepler.watch/pages/widerruf-formular.

§ 8 Warranty

(1) The statutory warranty rights apply.

(2) The included coin cell is a consumable. Its discharge through normal use is not a defect.

§ 9 Liability

(1) We are liable without limitation for intent and gross negligence, for injury to life, body or health, and under the German Product Liability Act.

(2) In cases of slight negligence, we are liable only for breaches of essential contractual obligations (obligations whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely), limited to the foreseeable damage typical for the contract.

(3) The statutory warranty rights remain unaffected.

§ 10 Product notes

(1) The Kepler Watch uses the case, buttons and strap of an original Casio F-91W, whose electronics are replaced by the Kepler module. Kepler Watch is not affiliated with Casio Computer Co., Ltd.; no Casio manufacturer's warranty applies.

(2) Because of the conversion, the water resistance of the case is no longer guaranteed. Treat the watch as not water-resistant.

(3) The phone features require a smartphone with a suitable app; on Android this is the free Kepler Gadgetbridge app.

§ 11 Open-source software

The firmware builds on the open-source project F91 Kepler by PegorK (MIT licence). The Android app Kepler Gadgetbridge is a fork of Gadgetbridge and is licensed under the GNU AGPL v3. The respective licence terms apply to this software; you can find the source code via kepler.watch/pages/app.

§ 12 Dispute resolution and final provisions

(1) We are neither willing nor obliged to take part in dispute resolution proceedings before a consumer arbitration board.

(2) German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. For consumers, this choice of law applies only insofar as it does not deprive them of the protection of mandatory provisions of the law of the country in which they have their habitual residence.

(3) Should any provision of these terms be invalid, the validity of the remaining provisions remains unaffected.

Last updated: October 2026