F99 Nimbus V3 Switch Gasket Structure with 5-layer noise reduction: F99 is a gasket-mounted keyboard with a PC plate and 5-layers premium silicone pads and noise reduction cotton to reduce 95% hollow noise,abosond typing noise, and enhance the unique soft and comfortable RGB backlight & Programmable software: F99 has multiple RGB backlit modes that you can switch with simple shortcuts. You can make your RGB effects with the F99 software. With the software, all kinds of keyboard key functions could be set, macro recorded. Hot Swappable PCB, Compatible with 3-Pin/5-Pin Switch: F99 is equipped with hot-swappable PCB to ensure free replacement or change of switches. It is compatible with most 3-pin and 5-pin mechanical switches. Multi-Device and Tri-Mode Wireless Connection: F99 supports USB wired, 2.4G wireless and BT 5.0 connection,a good option for users who has multiple devices.It's compatible with Laptop, iPad, IOS, Windows, Mac or Android. Customized Design Makes F99 the Perfect Chioce: ①Two-stage adjustable foot support design ②Side switching bottons and receiver storage slot ③ Cherry profile PBT meterial double shot keycaps ④Built- in 8000mhA capacity lithium battery which lasts for 400 hours.