Bought this ages ago for my wife's Spacewagon which had immobiliser but no alarm fitted (?), never used it, now both cars have manufacturer's security.
May do someone a turn for a second car, instructions are translated from Chinese, so you'd need to have an idea what you're doing.
Works with all sorts of central locking, and can be set to close windows.
Both remotes were working when I tried them for the pics, one's now not flashing, so I'll change the battery and see if that sorts it.
Weighs a kilo, so I'm looking at £20 posted (first class recorded), UK only)
I know paypal is usual, but it's a pain for me receiving, so postal order or similar please.