Radio push-button detector for TG55xA, house alarm, blue. Radio push-button detector for wall mounting for integration of radio smoke detector comfort VdS Q (up to 40 radio smoke detectors) and for manual triggering of a fire alarm. To do this, the glass pane is broken and the push button is pressed. A test alarm is triggered with the flap open. The push-button insert can be replaced separately after the low battery warning after approx. 10 years. The integrated 3 V lithium battery is not replaceable. Note: Only suitable for indoor use.