Antenna is very important for working voltage,and the length of the antenna is 17cm;2x 433MHZ transmitter module;2 x 433 MHz receiver module

• 2 pack 433MHz WL RF Transceiver Module for Remote Control + Receiver
• 2 pack 433Mhz RF

2 pack 433MHz WL RF Transceiver Module for Remote Control + ReceiverFivesix