Easily blocks up to 250 telemarketers, robocalls & other bothersome numbers with dedicated 1-touch call block buttons on base unit & handset; Clear Talking Caller ID alerts in Eng/Sp from base unit & handset when calls are received, plus talking low battery alerts; Smart background noise reduction; Includes rechargeable batteries for up to 12 hours talk time, 7 days standby; Expandable up to 6 handsets;