Profile: Line One specializes in providing business phone systems. Yealink SIP-T54S is an ease-of-use Media IP Phone with a 4.3-inch color-screen and a distinctive appearance and structure. For its simplified and human-friendly design as well as user interface, it brings the IP phone and users closer and boosts the operating experience. CP930W is a Wireless DECT conference phone that frees users from the limitations of power outlets and Internet ports. It is completely wireless with a range of approximately 150 feet indoor and 900 feet outdoor. The built-in rechargeable battery supports 24 hours of talk time, and requires less than 4 hours to be fully charged.