Transmitter: There are three pins on the transmitter: DATA, VCC, and GND. VCC can be connected to 3 to 12V DC. DATA is the data output pin, which is connected to digital 12 pin of Arduino. ANT is the point to connect to external antenna. Specification: Communication: AM modulation Communication frequency: 315MHz Frequency Stability: +/- 75KHz Transmitting Current: 3 - 50mA Working Voltage: DC 3-12V. The higher the voltage, the longer the communication distance Note: please don't use voltage higher than 12V.
