fingerprint access control with built-in back-up battery, access control interface for electric lock, door sensor, exit button ... screen with GUI interface for ease of useBuilt-in backup battery supports approx 4 hours continuous operationTCP/IP, RS232/485, ... , SMS, DLST, Self-Service Query, Automatic Status Switch, back-up batteryOptional function: ID/Mifare/HID reader, extensible barcode relay-bell ...