Basic smoke detector; laying the base is very simple and it is best to choose a woody support (beam, door frame) where the clip will be stronger than in the plasterboard (dowels provided are simple and not suitable) once the base securely attached by two small screws 25mm, the sensor must be activated by plugging the supplied 9v battery and is easily clipped with a slight twisting motion; once in place, a sufficiently long press the test button causes a red LED flashing and a shrill bell rang twice briefly; then you tend to press again on the button to silence do this is actually useless simply release the button causes the automatic shutdown; this maneuver may be repeated from time to time to check the battery status or when vacuuming or battery change (presumably seldom if the unit does not fire)
