1)Computer sync 2)Easy carry 3)USB plug-to-plug Compatibility. 4)System Requirments - Windows 98, ME, 2000, XP and NT 4.0 5)Available Models for: HP/PALM/DELL/SONY/O2 XDA/TOSHIBA/MIO/ VIEWSONIC/DOPDA/ASUS/SAMSUNG/BLACKBERRY/ SHARP/SPV/HANDSPRING/HITACHI/LENOVO/ACER/FUJITSULOOX