Accessory handset only requires an IS7121 series phone to operate. Voice Announce Caller ID. 50 Picture history. Push-to-Talk 1.8-inch color LCD display and 100-picture history. view larger Front porch screening Color display handset Voice Announce Caller ID/call waiting. view larger Accessory Handset with Color Display Surprise visitors can be great, but they're better when you can decide whether to greet them, before you're at the door. With this accessory handset, when used as part of the IS7121 cordless phone and video doorbell system, you can. Key Features Front Porch Video Screening When used with the IS7121 system, this handset is like caller ID for your front porch. With it, you can screen visitors before answering the door, without the worry of being seen. View a snapshot or stream video The video doorbell automatically snaps a photo and sends it to the handsets when visitors ring your doorbell. You can then stream video, audio, or both with just two buttons. Voice Announce Caller ID Always know who's calling, even when you're in the other room. The handset announces the names of your callers through the speakerphone. DECT 6.0 Digital Technology This interference-free technology provides superior voice and sound quality and higher protection against eavesdropping than 2.4GHz and 5.8GHz phone systems. What's in the Box 1 cordless handset, 1 charger, 1 power adapter, 1 battery, Quick Start guide Please note: This is an accessory handset only—it requires an IS7121-series phone to operate.