I get talked into an occasional wedding (very occasional and for friends, only). I use my Multiblitz monolights and have had great results in lighting a church area but it seems that the last couple of weddings I've done, everyone in the crowd has a pocketable digital and have my strobes going cycle/bang constantly. I've been looking for affordable alternatives and came upon this: IR Trigger What is doing the receiving for this type of device? The answer I got from the seller was: Thank you for your question. There are two cases: 1. If you use multiple strobes operated by AC main, there usually be optical receivers (triggers) equipped on top of them. You do not need any slave optical receivers (triggers). The IR bean from YS-100 will trigger one or all of them. If one is triggered by IR bean, the others will also be triggered at the same time by the flash came from the one being triggered by IR bean. 2. If you use flash units operated by battery or any strobes without any optical receivers, you need to buy a slave (optical-sensitive type) trigger for each of the flash units. This type of slave trigger is cheap and can be purchased in most of photographic stores. The scenario will like the case 1 then. Hope this information is helpful. Let me know if you have further queries. It seems that my light slaves on my units would still need to be active and I wouldn't gain anything here.... What am I missing? I suppose I can find a used Quantum radio set or something but I was intrigued by how these IR's really work.