418/433 MHz control system:

Various electronics mail order outlets are currently advertising simple and relatively cheap wireless control system for use in and around the house. Although these systems are type-approved1, that is no warrant whatsoever for sufficient range and reliability. The 433/418 MHz wireless control system discussed in this article does not aim to compete with these low-cost systems. Instead, it offers high-quality technology for a large number of applications, with special emphasis on reliability, security and connectivity.