... Optional built-in Li-Battery for time attendance5. External speaker plug port for scheduled bell ring6. Optional ID/Mifare/HID card reader7. Support ... port, keypad audio, anti-pass back, built-in photo ID, webserver for A/C, scheduled bell.Access control: built-in relay, ... sensor, alarm output, wired bell, door lock control,Optional functions: ID/Mifare/HID card reader, USB reader, RIS, built-in Li ...