Perixx PERIBOARD-514H Plus Wired Keyboard with Trackball - 14.57x5.39x1.02 Inch - USB Port with 2 Hubs - Trackball Updated in 2015 14.57x5.39x1.02 Inch Dimension (370x137x26mm) USB Interface with 2 extra USB Hubs and 1.8 Meter cable Fit with 19" Rack Drawer & Kiosk Application (Compatible with Cherry G84-4400 Design) If your alphabet typing appear with numbers (like J,K,L,etc), you may press Fn + Num Lock two keys together to enable or disable the number lock function logitech Microsoft adesso cherry razer 19" rack