The K990 is a standalone RFID Time Attendance and Access Control System supporting 40,000 users and 800,000 transactions. It features a 3.5" color TFT display, built-in card reader, and 32-bit microprocessor. Communication options include TCP/IP, USB, and optional WiFi/GPRS with inbuilt push data support. Access control features include Wiegand In/Out, relay for various locks, door sensor, anti-passback, and fire alarm support.