I purchased two of these small transmitters from eBay and struggled to find any useful information on them.
I am not sure if this is the intended set up for these devices, but it works well!
I already had some 315MHz receivers for another project (eBay Universal Wireless Super Regeneration 315MHZ Fixed Decoder Receiver Module), so I hoped that because they were both the same frequency that they would work together!
I did some testing with no antenna attached to the transmitter at this point and got a very logical response !
(I Googled the length of an antenna and found that a piece of wire 23.81 cm / 9.37 inch would be the optimim!).
On the EV1527 board there are 4 jumpers. On the fixed decoder receiver, there are 4 outputs.
I set all 4 jumpers to the H position on the transmitter and put the receiver into 'Learn' mode, i.e, I pressed the button and applied 5v to the transmitter.
Now the jumper positions are mimicked on the receiver whenever 5v is supplied - these will work with a 5v to 12v supply. !
See picture 4.
So it looks like there are 15 possible codes (plus all off of course !) on this little unit.