Razer BlackWidow Ultimate Mechanical PC Gaming Keyboard– Cherry MX Blue (RZ03-00381900-R3U1) Keyboard Interface: USB Design Style: Gaming Key Switch Type: Blue Cherry MX Keyboard Color: Black Dimensions: 18.72 x 6.74 x 0.79 Type: Wired System Requirement: PC with USB port Internet connection (for driver installation) At least 200MB of hard disk space Razer Synapse 2.0 registration (requiring a valid e-mail), software download, license acceptance, and internet connection needed to activate full features of product and for software updates. After activation, full features are available in optional offline mode.