Castles Technology announces the world’s smallest mobile terminal: the S1MINI

To mark its 30th anniversary, Castles Technology has this week launched it’s new-generation S1 MINI mobile device: the smallest terminal worldwide. It offers multifunctional capabilities and optimizes the checkout process. Easy, safe and secure, it’s made for merchants looking for a new-generation payment device.

The S1 MINI is based on secure, state-of-the-art technology (Android 10 and PCI 6) and is packed with features, including 4G LTE, Wi-Fi, Bluetooth, an intuitive display, and a front-facing HD camera. At 12 cm x 6.5 cm, it’s extremely lightweight. Thanks to its sleek, unique design, it offers multiple possibilities for optimizing the checkout process.

Android payment terminals manufactured by Castles Technology enable retailers to optimize their business and streamline the in-store experience, whether in a store or at any other point of sale. Castles Technology has long-standing expertise in this field. It was one of the first companies to develop its POS terminals based on Android, the open-source operating system created by Google that powers 70% of the world’s smartphones.

Sales of Android payment terminals account for over 60% of Castles Technology sales.

What are the advantages of an Android terminal?

In addition to the same functionalities as traditional terminals (acceptance of credit card and meal voucher payments, barcode reading), Android technology, its flexibility, power, and quick, easy implementation provide terminals with the capabilities needed to transform in-store activity, optimize sales environments and offer a multifunction solution that can integrate more complex applications:

  • POS software
  • customer database
  • optimize sales and customer loyalty with loyalty programs
  • payment by link, QR Code or gift voucher
  • digitizing the customer journey
  • omnichannel and augmented connectivity
  • inventory management, and much more
  • and, last but not least, to work with foolproof terminals: with Android, the annual failure rate is no more than 2%.

Management solutions are centralized on a single tool, saving valuable time and space for retailers.

Cutting-edge hardware based on tried-and-tested smartphone technology, giving them an edge over traditional payment terminals:

  • More power with an ultra-large memory
  • More connectivity, capable of switching from one connection to another in the event of signal loss (4/5G – WIFI)
  • More ergonomic, generally with a touchscreen
  • Greater security: Google is investing heavily to strengthen and extend the Android operating system.


With 30 years of experience in the global payments market, Castles Technology has established itself as one of the world’s top five manufacturers of Android acceptance terminals, offering secure, reliable, and transparent solutions. A global leader in its field, providing cutting-edge terminals, innovative solutions, and exceptional services to empower the payment ecosystem.

Castle Technology’s payment applications are targeted at merchants in finance, retail, hospitality, transportation, and other industries. Partnering with over 1,000 banks, merchants, FinTechs, acquirers, ISVs, and PSPs, it deploys millions of payment terminals worldwide for retailers of all sizes such as Total Energies, Adyen, and Nexi.

The company believes in the importance of innovation and sustainability and is committed to making a positive impact on the world through its products, services, and operations. As the foremost Android payment acceptance, Castles Technology offers secure, reliable, and seamless solutions with global and local reach. The company’s dedicated community of experts is committed to anticipating and shaping the future of commerce worldwide, while its powerful devices, secure payment solutions, and top-notch services ensure unparalleled quality and performance.

The U.S. headquarters is based in Atlanta, a fast-growing metropolis for payments and financial technology. The global headquarters are in Taipei City. Castles also has regional offices in France, Spain, Italy, Singapore, and Japan.


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