VTech IS7101 Accessory Cordless Handset, Black | Requires a VTech IS7121 Expandable Phone System to Operate DECT 6.0 Technology Accessory handset onlyrequires a IS7121 series phone to operate Front Porch Video Screening Take a snapshot, or stream video 1.8-inch color display on handset Caller ID/Call Waiting*stores 50 calls DSL Subscribers may need to us a DSL Filter For optimal performance batteries should be charged for 16 hours prior to use