433MHz is a commonly used frequency band for all types of equipment that require little power, such as garage door openers, headphones, baby phones and remote controls. Also many inexpensive transmitters and receivers for switching devices and light dimmers operate on the 433MHz band. Due to the absence of bidirectional communication and encryption, protocols are often of a simple nature. Because many different types of devices are permitted to use this frequency, it is more susceptible to interference than the 868 MHz.
The length of the antenna
Many people think that the range of the remote control is determined by the length of the antenna. However, the length of the antenna has an influence on the frequency. In the 433 MHz frequency, this 16.5 cm (from the base).