The unit can be connected directly to the telephone line and will automatically record the last number dialed up to 16 digits. You can also use the unit with it's built in microphone to decode numbers that you have recorded on a tape recorder. The unit has an easy to read LED display and comes complete with a computer disk explaining the circuit. This is probably the finest device we carry. It costs a little more than most, but is well worth it.
Assembled version is available below.
The unit shown above, completely assembled and tested.