USB Cordless/VoIP Phone Support MSN Yahoo Messenger USB 1.1 / 2.0 compatible Software / driver contained in CD Handset dimension: 5.5"x1.6"x1" Support operating system window XP, 2000 Package contents: 1 x Handset; 1 x Battery; 1 x Base; 1 x USB cable; 1 x CD; 1 x English manual