21 Keys Standard Layout The K21 features a conventional 21-key numpad layout, making it ideal for data entry, gaming, and numerical input. The hot-swappable design allows for easy customization and maintenance. Transparent PC Case with Pudding Keycaps The transparent PC case beautifully showcases the RGB lighting, further enhanced by the pudding-style keycaps. This combination not only adds to the visual appeal but also allows for more prominent RGB illumination. 18 Pre-set RGB Effects With 18 default RGB lighting effects, enjoy a vibrant and dynamic backlighting experience. Customization is made possible with driver support, allowing you to personalize your numpad to your liking. Triple-Mode Connectivity Offering unparalleled flexibility, the K21 can connect with up to three devices simultaneously. Easily switch between devices with Bluetooth mode, enjoy the fast and stable connection of 2.4Ghz wireless within a 10-meter range, or opt for the reliability of a Type-C wired connection. Durable 600mAh Battery The built-in 600mAh battery ensures long-lasting performance. The FN key light flashes to indicate low battery, stays on during charging, and turns off when fully charged. Specifications for Custom Switch LEOBOG Ice Crystal Switch Type: Linear Pin: 5 pins Factory Lubed: Yes Material: POM Stem, PC Housings Initial Force: 29gf Actuation Force: 35±3gf Bottom-out Force: 48±3gf Total Travel: 3.7±0.3mm Actuation Travel: 1.8±0.3mm Lifespan: 60 Million Keystrokes