The BT8610 Premium Nuisance Call Blocker, powered by trueCalls award winning technology, offers users complete control over which calls they want to take and those they wish to block. With the BT8610 youll never have to speak to another cold caller again. You must subscribe to a Caller Display service from your network provider to block nuisance calls and use visual voicemail. Charges may apply. Avoid nuisance and unwanted calls with multi-award winning truecall blocking technology - type 3 call blocking - blocks a specific list of numbers and has either a virtual answering assistant or audible name announcment. 1.8; colour backlit display screen, internal calls and call transfer, block up to 1000 numbers, auto copy contacts between handsets. Telephone information: 200 name and number memories. 15 ringtones. Last number redial. Caller ID. Call log. Handsfree facility. Speaker and ringer volume control. Up to 21 hours talktime/ 240 hours standby. Up to 50m indoor range/300m outdoor range. Out of range indicator. Low battery indicator. 3 - Blocks a specific list of numbers and has either a virtual answering assistant or audible name announcement. Answer machine recording time 60mins. Personalised recording facility.