iSocket can detect flickers/glitches (by fact, outages) of at least 100ms duration when the setting of power failure delay is set to "0" (it is set to 1 second from the factory). Of course, different factors should be taken into consideration, such as capacitance, length of wires, etc. It is important to understand what exactly means the outage for iSocket. The outage is a drop of the mains power (input power provided to iSocket) below ~90 VAC for ~100ms, while your equipment will be, and most probably must be, connected to the mains separately from iSocket. When you consider using any external glitches detection device which is not a part of the monitored equipment itself, you should understand that regardless of parameters of glitches/flickers an outage for a one equipment not necessarily will be the same for another. Generally, no one external device can guarantee 100% correct detection of glitches for another device, because characteristics of two devices connected to the mains separately will be different. You will either have false alarms or no alarms from time to time. Only a built-in facility of the monitored equipment itself can be considered as 100% guarantee if your concern are brown outs (glitches). The recommended option if your concern are power glitches will be to use a small UPS or even a surge protector for your equipment so that it can survive short outages and keep iSocket for notifications about longer outages as there will be no any external device that can help you to detect such short outages. Worth mentioning, if you don’t receive a power glitch alarm with the setting of the power failure delay to zero but your equipment is switching off then your equipment really needs some frontend protection first - a protection that allows you to delay the outage.