Seeed Studio 113990010 433MHz RF Transmitter and Receiver Link Kit

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.

• Frequency: 433MHz
• Modulation: ASK
• Receiver data output: High - 1/2 Vcc, Low - 0.7V
• Transmitter input voltage: 3 to 12V DC (higher voltage = more transmit power)
• Transmitting range (at 5V): 40m indoor, and 100m in open air
• Compatible with Arduino