Incoming Call Features: >> Block up to 1,200 incoming phone & fax numbers with 1-touch Button (BLACKLIST) >> Block all incoming calls from entire area codes or prefixes (up to 10 sets) >> Block all incoming calls with no Caller ID info (Turn ON/OFF as needed) >> Stores/browse up to 100 (most recent) incoming call records (including date/time of calls) >> Requires passcode (user-changeable) to remove all numbers stored in blacklist (safety feature) * Outgoing Call Features: >> Block up to 100 outgoing phone numbers, prefixes and area codes >> Stores/browse up to 50 (most recent) outgoing call records (including date/time of calls) * Other Features: >> Line powered - Requires no external power supplies or batteries >> Maintains settings & stored numbers even after disconnected from phone line (non-volatile EEPROM memory) >> 16-digit telephone number LCD display with 4 levels of brightness >> Compatible with FSK/DTMF, PSTN landlines, and VOIP services * Documentation: >> Step-by-Step User Manual - This very useful manual includes photos with installation setup options, step-by-steps instructions on how to use and program each feature. * Support: >> Visit hqtelecom.com for revised manual, frequently asked questions (FAQs), and live support.