Different card readers use different technologies to perform a variety of functions. Card readers can be used to perform tasks like granting access to doors, locking server cabinets, and more, making them an ideal component in many access control systems. Proximity cards readers, provide access and security without requiring insertion of a card. This contactless approach makes these readers an excellent solution for many security and access applications, including parking lots, secure areas, and general building access. Because the readers do not need a card to be inserted or swiped, they are unaffected by snow, ice or rain, making them very reliable and perfect for outdoor use. Card readers also come in a variety of sizes, colours and security levels.