SF stands for Sixty-Five, Ducky make ground breaking sizes for customers\' choice. Most used function keys set: 4 arrow keys, delete, page up, and page down keys.The Features of Ducky One2 SF RGB Mechanical Gaming Keyboard at a Glance:65% sizeAll New Petite Bezel DesignOptimized Comfort - 3 level angle adjustment keyboard standRGB LightingGerman Red Cherry MX key switchesPBT double-shot seamless keycapsUltra Fast ReactionsDetachable USB Type-CNew and ImprovedThe new bezel design shares a similar sleek frame as its predecessor, but the One 2 SF incorporates dual colours on the bezel to better match all varieties of keycap colourways. For your comfort, it has a 3 level angle adjustment keyboard stand. It features diversified RGB light effects with fully customizable hardware. It utilizes 3528 SMD RGB LEDs. It has Cherry MX Switches and PBT keycaps for durable, exceptional, and reliable performance. We use USB HID with the highest frequency of 1000Hz polling rate, meaning the keyboard is sending its input signal(s) to your PC 1000 times per second. With Anti-Ghosting it can handle any number of simultaneous key presses with the option of N-key or 6-Key Rollover.Ducky One2 SF RGB Mechanical Gaming Keyboard Specifications:Product NumberDKON1967STStructureMechanical structureTrigger switchRed Cherry MX mechanical switchesConnection interfaceUSB 2.0Keycap materialABS or PBTOutput key numberUSB N-Key RolloverPrinting technologyDouble-Shot or Laser EngravedDimensions325 x 108 x 40 mmWeight635gOrigin of productionTaiwanLayoutUK ISO