Romer-G mechanical switches - Deliver quiet, precise mechanical performance and 70-million click life for incredible feel and durability Six programmable G-keys - Put custom macro sequences and in-app commands at your fingertips. Customize G-key profiles individually for each app Connect using LIGHTSPEED or Bluetooth - Connect to LIGHTSPEED wireless for super fast 1ms report rate or connect to other devices with the push of a button using Bluetooth connectivity Multihost Bluetooth functionality - Offers convenient pairing for up to eight devices (Switch between high-performance LIGHTSPEED wireless and Bluetooth anytime quickly and easily) Windows and Mac compatible - Works with most operation systems include Windows, Mac OS, Chrome OS, Android, and iOS for use with your existing devices