TR-1 with NEN Chip

-Phone line powered
Non-volatile E 2 memory
Compatible with Touch Tone or rotary phones etc
.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
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
Made in the USA
One year warranty