With the AT&T CL82407 DECT 6.0 4-Handset Expandable Cordless Phone with Long Range and Smart Call Blocker, you won't have to worry about unwanted calls waking you up in the middle of the night or tying up the line. Robocalls are automatically blocked from ever ringing through—even the first time. You can also permanently blacklist any number you want with one touch. A digital answering system that can record up to 22 minutes of incoming messages, outgoing announcements, and memos to help you stay organized. This reliable cordless system brings you long range, HD audio and extra features like caller ID announce and push-to-talk for effortless calls from any room in your home. Plus, the large buttons and extra-large screen make it easy to see and dial calls. Easily add accessory handsets—up to 12 total—with just one phone jack.；The product voltage arrange is 110V.