A big button ring RF transmitter, it send 1x one channel signal to receiver.
With back adhesive, you can install anywhere you like.
Based on learning code method, internal EV1527 encoder + transmitter solution.
Configure to link with common learning-code receiver, for example our EDRF1 and EDRF2 in this category.
Internal use CR2032 coin cell battery.
Diameter 50mm (5CM).
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cheap, easy to use, receive and send module in ISM 433 MHz, and also work with arduino!