... with built-in back-up battery, C1 controller is optional IN03 is an innovative biometric fingerprint reader for time attendance applications, built-in 2000 mAh backup battery ... card readerBuilt-in Serial and Ethernet portsMulti Language supportBuilt-in battery backup provides approx 4 hours continuous ... SMSOptional Functions: C1 Controller, ID/Mifare/HID, Photo ID, Printer, 14 digit user ID, Webserver, ...