Optical sensor resolution: 1200 dpiNumber of buttons: 3.Power supply: 2xAAACompatible operating systems: Windows 8 or later, Mac OS X 10.10 or later, ..
4 or 8 FXS ports with PSTN life line in case of power failure2 10/100 Mbps network ports (switched or routed)Comprehensive codec support, caller ID, f..