The BT 3580 comes with 50 name and number nuisance call blacklist capability to block those persistent and unwanted nuisance calls and 50 number VIP list to let through the most important callers. You must subscribe to a Caller Display service from your network provider to block nuisance calls. Charges may apply. Avoid nuisance and unwanted calls with type 1 call blocking - 50 number blacklist and 50 number VIP list to let through the most important callers or use "do not disturb" to silence your calls. Easy to set-up, has an answer machine and loud speaker to free up your hands when needed. It's also really easy to access features like call divert, three way calling, and call waiting. Telephone information: 50 name and number memories. 5 ringtones. Last number redial. Caller ID. Call log. Call divert. Hands-free facility. Speaker and ringer volume control. Hearing aid compatible. Up to 10 hours talk time / 200 hours standby. Up to 50m indoor range/300m outdoor range. Out of range indicator. Low battery indicator. 1 - Blocks a specific list of numbers. Answer machine recording time 20mins. Personalised recording facility.