The Qolsys IQSM IQ Shock Mini-S Sensor is an encrypted sensor with superior range specifically designed with multi-level vibration detection. This is the replacement model for the QS1138-840 SIQ Shock Sensor.  It can alert you if a door is left open, automatically adjust your smart thermostat to save you energy, and provide security for anything that opens or closes. Know when these doors and windows are opened with customizable chimes and unique names spoken by the panels text-to-speech. Create personalized notifications and rules with the interactive app.