Telecom buyers will recognize this as a Panasonic KX-TSC11 that has been modified with special amplification, making it appropriate for home or office use for hearing impaired users

Note that, if planning to use it in an office, it is an analog single-line device, so you will need to connect it either directly to an outside line or to an analog port on a PBX. Also, caller ID will not work if the line doesn't have caller id service nor if the PBX port cannot pass caller ID through