Product Description Applications: Homes or institutions with mentally ill individuals Company with abusive staff Prevent to call to restricted phone numbers/prefixes Restrict to call to allow list phone numbers/prefixes only Intercept and redirect calls to pre-programmed number Features: TOB115 can be programmed to block calls to 911, 411, 311 or any other up to 8-digit long number. If the number is longer than 8 digits, you may block numbers with prefix. It can also block all outgoing numbers except the white list numbers. TOB115 can intercept the restricted phone numbers and redirect the call to programmed phone number(e.g. your mobile phone number). Telephone line powered, no need extra power supply or battery. Easy to install and program. Users could program it locally using a standard touch tone phone. LeCall service man could help customers to program the blockers remotely. It is free. Compatible with any regular telephone lines, VoIP landlines, analog PABX/KSU extension lines. System password prevents others changing the programming. If you have changed the system password, please do remember it, or you could NOT reprogram it. The programming would retain even if the dialer is disconnected from phone line. Disclaimer: In some states, there are laws stating that you can NOT block access to 911 calls. It's your responsibility to make sure you are not in violation of these laws. Packing list: TOB115 outgoing call blocker×1; 1meter RJ11 cable×1. Warranty: Two years quality warranty. Free technical support.