The hand-held transmitter SHT-12 BS enables the remote control of up to 4 functions of a radio module or receiver of the radio series SH-12.A blue LED indicates transmission mode. It not only displays transmitted radio signals, but also provides information about the quality of radio communication and the transmitter supply voltage. The red LED indicates, depending on the wiring on the radio receiver, either the status of the receiver supply voltage or the receipt of the receiver confirmation. A confirmation of the receiver is also signaled acoustically via an integrated beeper. If the confirmation is deactivated, each change of the key status is signaled instead.With the profile seal, shock protection and a special keyboard foil, the hand-held transmitter is very well protected against mechanical impact and moisture and can also be used in harsh and humid environments.The hand-held transmitters of the SH-12 radio series work extremely without interference due to their special transmission characteristics. With the interference-resistant radio transmission with extremely short response times, ranges over 1000m can be achieved.For severe narrow-band interference or the use of several parallel radio systems, the working frequency can be set to suit individual requirements. The SH-12 radio series can be operated both unidirectional and bidirectional. In bi-directional communication, the transmitter automatically adjusts its transmission behavior to the quality of the radio link. The transmitters are programd ex works with a serial number. This provides for more security and makes each transmitter a clearly distinguishable unique.This text is machine translated.