Flynt J Mathematics and Physics for Programmers 2ed 2012

• 【Compact Keyboard with Numpad】Unlike bulky full-sized layout, this 85% keyboard saves more desk space but keep the numkeys which is essential. Press Fn+Backspace to lock/unlock the numkeys (Note: The numpad lights up ONLY when it's unlocked, the rest of the keys don't have lighting)
  
• 【Colorful PBT Keycaps】 Constructed from unique and high-quality durable PBT keycaps, Havit mechanical keyboard has excellent touch experience and long serving time. Colorful keycaps can bring a more pleasant mood during games or work, decorate your space and enhance your life.
  
• 【Red Switches Keyboard for Different Needs】Perfect for office typing or playing games. Havit HV-KB487L wired keyboard frees up your desk during work, after working sessions, you can enjoy the keyboard for gaming, or bring it with you as the size is compact and easy to carry out.
  
• 【Ergonomic Comfort】The design of this mechanical gaming keyboard is based on ergonomics, the two keyboard kickstands provide comfortable angle for typing and effectively reduces the burden on the wrist.
  
• 【Wide Compatibility】This 89 key mechanical keyboard is compatible with Windows 10, Windows 8, Windows 7, Windows XP, Windows VISTA and other systems. Cautions: For Mac OS and Chrome OS system, the Num Lock function is not available, so the number pad is unable to be locked and will stay on.