Phone line powered- Non-volatile E2 memory- Compatible with Touch Tone or rotary phones- .5 to 49.5 minute call timer with disconnect- Programmable allow or restrict table stores up to forty 12-digit phone numbers, prefixes, or area codes- 6 digit bypass code for single call override- Programmable to ignore phone system line access numbers- Programmable ignore table stores up to twelve 12-digit phone numbers, ideal for 67, 69, etc.- Programmable maximum digit string length- Concealed in a standard RJ11C jack- Allow or restrict 1-800 numbers- Operational alert tones- Allows emergency and toll free numbers