| 摘要 |
An alarm installation, with transmitter, and receiver unit has impact protection and is installed as a compact appliance in a housing. A tri-functional appliance has acoustic protection, a transmitter, and receiver having a range up to 1000m. A steel housing and compact electronics with all switching systems for the transmitter are provided. A cover for the steel housing and loudspeaker is provided, and a housing is available for the transmitter switching system.
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