The ZKTeco K40 is a 2.8-inch TFT screen time attendance & simple access control terminal. It has interfaces for third-party electric locks and exit buttons. TCP/IP and USB Host make data management extremely easy. Most importantly, the built-in backup battery can eliminate the trouble of power failure. With an elegant appearance and reliable quality, you can get the best from it. Special features of TCP/IP, USB host, built-in battery, simple access control or external bell, and SSR report in Excel form.