The Panasonic KX-TGA950B is an additional handset to expand the 2-Line Link2Cell Cordless Answering Systems (models KX-TG9541B and KX-TG9542B). Import up to 600 contacts wirelessly from your smart cellular devices into your Link2Cell system. Once the system is linked to your cell phone you can receive alerts whenever you receive and incoming call or text. The voice equalizer setting allows users to adjust the tone of incoming calls to enhance voice clarity and reduce background noise. This handset is an accessory to models KX-TG9541B and KX-TG9542B will not operate on its own.