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Manufactures page please!
There are a lot of cheapies on Ebay. Some say they have trunk pop and car locator functions,but none mention if they’re hold and release or a timed output. You could ask the sellers though. Some are in hong kong. “We no ship weekend” lol
Search: keyless entry kit
Here is the manual for most of the cheapo keyless entry systems from china/hongkong on ebay…
http://www.sendspace.com/file/n54cry
Came from this ad, I requested the manual from the seller
http://cgi.ebay.com/ebaymotors/Car-Remote-Control-Keyless-Entry-Door-Lock-Locking-Kit5-/180722063730?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a13dfd972
Heres the ones I get & use:D
100m Two channel momentary push button remote fob.
I want one 
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Straight from UK - about 28 bux.
:Link removed for Stinky: lol
Or this Ebay store has different ones from China/Hong Kong.
http://stores.ebay.com/e-MadeinCHN
The Ebay store with the China stuff has a real website.
You can basically pick all your options.
They have a series of transmitters with slide covers.
You just need to make sure that it’s compatible with the receiver you pick.
Lol…shhhhhhhhhhh I charge approx £20 per unit lol…
And no, there is no way of locking them… scares the crap outta ya just as your sitting down to dinner when its in your pocket:eek::eek::eek:!!!lol
Oh and I have used the ones from china, tho I did find putting the aerial up was a bit of a pain & also occasionally my Horns were set off by stray frequencies… a big problem at 2AM in the morning when ya horns are going off on their own!!!
^^^ OK I cleaned that up for ya - don’t want to step on your toes. haha
I wonder if the rolling code or learning code units from China would be any better.
Did you try one with fixed code?
Lol… 
Mine was a selectable code (micro switches) but they still seemed to go off, another particular time was driving behind a police car lol:D
Whoah did the driver of the police car get mad?
Hmm, I wouldn’t buy this sort of thing unless it had a button disabler and it has to be sophisticated enough to not be triggered by stray frequencies! Some sort of unique digital communica.
They slowed to a crawl and he was looking in his rear view mirror. I was just thinking “SH*TTTTTTTTTT” and decided to do the “looking behind me trick” and shrugging my shoulders. I disabled that device the moment I got home!!!
I now dont carry the fob attached to my keys no more and now I keep it on a long ID ribbon around my neck.