I'm a qualified audio engineer so I thought it would be helpful to write a review on these. I bought them for the kids to use at school (I'm a music teacher now) as I was sick of repairing XLR cables that the kids seem to enjoy stretching and pulling at every opportunity. Personally I think they're a decent bargain considering the price although you wouldn't use them for anything other than practice.
Anyways the kit itself. In the box you get a black receiver unit with an unbalanced jack input, as well as two black matte plastic microphones. They actually look reasonable and feel decent enough so can't complain there considering the price paid. Just for info there's no separate volume controls for the microphones on the receiver so if one singer is very loud and the other isn't, there isn't much you can do about it...
Also the mics take 9v batteries, which go in the bottom and are tightened into place by the battery cover.
Sound wise they're not great and very hissy, although again for the price paid, I'd say you're getting what you pay for. Certainly they're ideal for practice purposes and so far they've proved pretty durable although I'm only letting kids I trust use them and have told the kids to handle them with care. They do feel like they would break easily if dropped or something but ultimately it's how you treat them that will matter most.
I'll update this in a few weeks to let people know if they're still working as I know a lot of people have reported that their system packed up pretty quick. For £16 though I think these are a bargain although as I say you'd only use them for practice purposes and you'd have to handle them with real care.