The Panasonic KX-TVS50 provides 32 mailboxes, 2 hours of recording time, and has two ports

The Panasonic KX-TVS75 provides 64 mailboxes, 6 hours of recording time, and has two ports. It can not be expanded

The Panasonic KX-TVS80 provides 64 mailboxes, 2 hours of recording time, and has two ports

The Panasonic KX-TVS100 provides 64 mailboxes, 16 hours of recording time, and has two ports. The optional KX-TVS102 expansion module adds two more ports