Discover the pinnacle of portable payment technology with the S1F4 PRO by Castles 
Technology. Developed on the modern Android 13 OS, this state-of-the-art device is 
engineered for unparalleled performance and adaptability. 
Boasting an industry-leading octa-core processor with extra-large screen, integrated 
printer, and versatile connectivity options in a sleek and stylish hand-over design, the 
S1F4 PRO is a portable powerhouse ideal for businesses in retail, restaurant, hospitality, 
banking and beyond