Testifire 25-001 Spare Remote, Generation of test stimuli starts when Testifire is positioned over a detector and the infrared beam within the transparent cup is interrupted. Certain detectors (such as those with virtual chambers) have no physical features to cause stimuli generation to start. The Optional Testifire 25 Infrared Remote Control can be used to initiate the test procedure in such situations. The Remote control is operated by aiming the LED towards Testifire when it is at height and the control button is used to start/stop a test, and/or move on to the next test in the sequence.