Purchased these for my Sony a57 to trigger my Metz 50 speedlite.
Fitted 2 batteries, attached receiver to flash & transmitter to camera - set the channel to 1, turned everything on & hey presto - job done & working like a charm, firing reliably every time.
Construction is on the plasticky side but hey, this system is under £20 and WORKS out of the box with no fiddling. Sure you can pay way more & get a pocket wizard if you're a pro but I'm a hobbyist & these are a bargain.
The reason I bought these btw, is I didn't want to have to use the on camera flash to trigger the Metz when it was off camera.
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