Vtech CM18045 4-Line Accessory Cordless Phone HandsetThe Vtech CM18045 4 Line Accessory Cordless Phone Handset is a convenient extension for your Vtech main console. It does not function as a stand alone phone. This handset registers wirelessly via secure DECT technology for use anywhere in your office. Its compatible with up to four phone lines and has an extra large display for easy visibility. This headset compatible full duplex speaker phone allows for hassle free handsfree calling. 10 number speed