Compatible with a wide range of devices and operating systems, simplifying your office's tech situation. Its pre-installed batteries last up to 24 months for extended typing, allowing you to avoid wired use that limits your mobility. Full-size, easy-to-read concave keys make typing quick and comfortable, and a built-in tray sits in front of the keyboard to support phones and tablets in a comfortable upright position for convenient use. Wired/Wireless: Wireless; Maximum Wireless Range: 33 ft; Connector/Port/Interface: Bluetooth; USB; Keyboard Design: Standard.