Put an end to nuisance calls with the stylish BT6510. It allows you to block calls from international and withheld numbers and in case its a genuine caller they can still leave a message. Save up to 200 contacts with copy between handsets, hands free to screen calls and hear whos leaving a message. (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 2 call blocking - blocks a specific list of numbers and common nuisance call types e. G. International or witheld. 1.8; backlit display screen, text messaging, internal calls. Telephone information: 200 name and number memories. 10 ringtones. Last number redial. Caller ID. Call log. Handsfree facility. Speaker and ringer volume control. Up to 22 hours talktime/ 240 hours standby. Up to 50m indoor range/300m outdoor range. Out of range indicator. Low battery indicator. 2 - Blocks a specific list of numbers and common nuisance call types e. G. International or withheld numbers. Answer machine recording time 30mins. Personalised recording facility.