The ultrasonic sensors (usually at the top of the A-pillars) might be too sensitive. Air currents from a slightly open window can trigger them.
The versatility of the Gemel Txshs lies in its three primary operational modes. Understanding these is critical for the user manual to be effective.
The casing usually features a snap-fit or screw-secured back panel to allow for battery replacement.
For specific troubleshooting, the UKGSer forum contains threads specifically regarding "Gemel TXSHS alarm operating advice". Gemel TXSHS alarm operating advice needed - UKGSer