... 3'' TFT touch screen 3. Built-in backup battery 4. USB, Wiegand in/out Introduction:Face multi-biometric identification time attendance ... 10.02000mAh backup battery: OptionalCommunications: RS232/485, TCP/IP, Two USB-hostStandard Functions: Extendable Scheduled-bell, DLST, Self-Inquiry, Work Code ... Humidity: 20%-80%Dimension: 193.6X165X111 mmNet Weight: 2.1kg Facial Time Attendance and Access Control