The telephone is designed for use behind a standard analog phone line (landline/POTs or VoIP) or registered PABX system. This auto-dialer emergency phone can auto dial a pre-programmed phone number e.g. 911 and/or also receive calls (ringer is adjustable). Note: This telephone cannot be used with digital PABX station ports. Data port – Provides a convenient extension of the connected telephone line for connecting a device such as a modem, fax, or answering machine. Dimensions: 8.75” (l) x 6.0” (w) x 2.75” (h). Weight: 3.1 lbs (14.06kg). Certifications: FCC Part 68, FCC Part 15 & UL 1459 Ref. ADA/FCC Hearing Aid Compliant.