Using this EMAX F4 Magnum II Video Transmitter VTX is easy. First, make sure your quadcopter's power supply is between 4.5V and 5.5V. Connect the transmitter to your quadcopter and an antenna to the 50Ω antenna port. You can then select from 37 channels and adjust the transmit power between 25mW and 200mW according to your needs. When using, avoid exposing it to extreme temperatures. For maintenance, keep it clean and dry. If it gets dirty, use a soft, dry cloth to gently wipe it. Don't try to disassemble it on your own as it may damage the internal components.