This is an easy to build kit that can be assembled in less than an hour. This little transmitter does not reguire a battery it is powered by the phone line and uses the same phone line as an antenna. It's a fun kit to experiment with. The telephone line transmitter shown above, fully assembled and tested. This kit is probably the most sophistcated we carry.
Assembly time is about two hours.
The assembly time is well worth it. These are some of the hardest devices to find and you usually pay big money for them. The kit comes with all of the components and a case. The fully assembled unit is about the size of a walkman. The unit can be connected directly to the telephone line and will automatically record the last number dialed up to 16 digits.