The Lee Telecrane F21-4SB is a compact push-button radio remote control constructed in a fiber-glass framework that complies to IP 65 protection class. It displays 2 up to 6 commands and can allow minimal power consumption through its 2 AA batteries that withstand up to 4 months. In addition, it is available with over 4.3 billion of unique ID codes and can operate in thermal range of -35 °C up to +85 °C.