Economical ProteanTM Radio Remote Controls provide safe and reliable operation of many types of electrical machinery and crane controls. These FM radios have internal antennas for a 330 foot (100 meter) range and many advanced security and reliability features. Kits include one receiver and either one or two transmitters, as noted below. NEMA 4 (IP65) enclosures. Economical ProteanTM Radio Remote Control transmitters are available in 4, 6, & 8 button single-speed configurations.