VTech SN6107 CareLine Accessory Cordless Handset, White | Requires a VTech SN6197 or Other Models to Operate Accessory handset only - requires a SN61x7 series phone to operate Any key answer, Volume control and Backlit keypad and display Caller ID/Call Waiting - stores 50 calls, Voice Announce Caller ID DECT 6.0 Technology, Audio Assist, Big buttons and large displays DSL Subscribers may need to us a DSL Filter For optimal performance batteries should be charged for 16 hours prior to use