T-Lock Call Blocker (NEWEST Version Available!) w/ 1-Year Extended Warranty by HQTelecom Incoming Call Features: Block up to 1,500 incoming phone & fax numbers with 1-touch Button (BLACKLIST) &gt;&gt; Block all incoming calls from entire area codes or prefixes (up to 10 sets) &gt;&gt; Block all incoming calls with no Caller ID info (Turn ON/OFF as needed) &gt;&gt; Stores/browse up to 100 (most recent) incoming call records (including date/time of calls) &gt;&gt; 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 &gt;&gt; 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 &gt;&gt; Maintains settings & stored numbers even after disconnected from phone line (non-volatile EEPROM memory) &gt;&gt; 16-digit telephone number LCD display with 4 levels of brightness &gt;&gt; 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. Includes a 12-month subscription to HQTelecom's Virtual BLACKLIST Unsolicited Phone number Online Lookup service.