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Seeed 433MHz RF Transmitter and Receiver Link Kits - Seeed Studio 113990010, The 433Mhz RF Transmitter and Receiver kit from Seeed Studio consists of one transmitter and one receiver and is useful for remote control projects that don't require two-way communication. To attach one of these modules to a microcontroller you need to supply power (3.3 to 6V DC) and either a serial transmit or receive signal, so it's very light in terms of GPIO pins.Seeed provide technical documentation, example projects and software libraries on their product pages. if you require this information please visit this product's page. Seeed 113990010 433MHz RF Transmitter and Receiver Link Kit