I was a bit skeptical. From an IR Flash Trigger I expected that there are problems in the "shadow". However, I was able to discover to my delight, that it at least in the indoor area easily triggered even in the absence of sight. Even from the next room working triggering problems. The problem with the special batteries is to cope with for me as well as they are thanks to the Internet to obtain relatively favorable. The equipment price is unfortunately too high in proportion to the Far East-replica. That is why a star deduction. Otherwise full purchase recommendation ...