This Keyboard ( see photo ) is sturdy and well-built, with excellent fit and finish. The silicone damper layer is one of the main contributors to the beefy weight of nearly 900 grams. The backlighting colour schemes are impressive [ press Fn+PD to cycle through the multitude of keyboard lighting modes until selecting a favourite ]. I chose incorrectly since I would prefer the key labels to be on the top, rather than the facing-side, but otherwise, I am very happy with the device, and will spend plenty of keyboard-time with it.For the uninitiated, this 60% keyboard is compact (smaller than a full-size keyboard) and has roughly 60% of the keys normally found on a full-sized keyboard. The design leaves out several less commonly used keys, arranging the remaining keys in a more compact cluster.This mechanical keyboard is more durable, and uses individual mechanical switches beneath each key providing a more tactile, responsive, and accurate typing experience.Windows Notebook PC;In ‘Wired’ Mode, with the included USB-C cable, connected to a notebook computer running WIN10, the device was instantly recognized and operable. All keys were recognized, and very responsive.In ‘2.4G’ Mode, with the small 2.4G dongle was released from its’ very-handy magnetic grip at the back of the keyboard and connected to a notebook computer running WIN 10, the device was instantly recognized operable and all keys were recognized and very responsive.I could not test Windows Bluetooth connectivity as my notebook PC does not support it.IOS iPad;Once paired with an iPad Mini 2 in Bluetooth mode, the device was instantly and successfully, recognized as an external ‘X66 5.0-1’ keyboard. All applicable keys worked well.Android phone;Once paired in Bluetooth mode, and also in ‘Wired’ mode [using a user-supplied USB-C to USB-C cable directly connected] to a Samsung Galaxy A15 Android phone, the device was instantly and successfully, recognized as an external ‘X66 5.0-1’ keyboard. All applicable keys worked well in an SMS App ( needed to Tab over to ‘Send Message’ icon ).Website;The manual ( see photos for excerpts ), and a software download of the associated ‘Windows 1.0.0 Driver’, are available at the ‘attackshark’ website on the ‘driver-download’ page under ‘Attack Shark X66’ keyboard.