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The most powerful circuit we've seen that operates on such low voltage (just two AA batteries). A range of 150 to 200ft can be expected and, given a good antenna and FM receiver, over 1 mile can be expected. An external power supply can be used up to 9 volts. Transmits to the FM radio band. Teaches basics of transmitters. Microphone is included.
Specifications:
L: 1-3/4" W: 3/4" H: 1/2"
Requires 2 AA batteries (holder included, not show in picture).
Transmission frequency is user selectable.
Transmission can be listened to on any FM radio.
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