4-Line telephone business system with cord expands up to 16 extensions and offers Caller ID/Call Waiting. Each base station can expand to include one DECT 6.0 Accessory Cordless Handset (sold separately). Telephone features intercom, digital volume control, base speakerphone, 99 name/number Caller ID history, 16 programmable one-touch speed dials, 94 record programmable name/number directory, three-party call conferencing, a Do Not Disturb/privacy setting. Auxiliary jack can be used for fax or modem. Trilingual display can be viewed in English, Spanish and French. Includes headset jack and data port. Hearing aid compatible. Uses four AAA batteries. Weighs 5.8 lb.