1. [21 Keys] Expand your desk space with this 21-key mechanical numeric keypad, ideal for laptop users, banking professionals, financial securities traders, businessmen, or anyone needing a numeric keypad. Its compact and lightweight design makes it convenient to carry. 2. [Stepped Keycap] Featuring an ergonomic stepped keycap design, it fits your hands naturally and helps prevent fatigue. The spring-type ergonomic design supports your wrist. Compatible with PC and desktop computers running Windows 2000/XP/Vista/7/8/10, Android, Linux, and iOS. 3. [Fadeless] Built for extreme durability, it guarantees 50 million keystrokes, ensuring the key legends never fade. The ABS construction is robust enough to withstand tough conditions. 4. [Mechanical] Equipped with professional mechanical blue switches, it offers tactile feedback and an audible click, delivering fast and accurate keystrokes. 5. [No Driver Required] Simply plug and play with its USB Type-C interface; no drivers are needed. Supports NumLock, ESC, Tab, Delete, and more.