[frenchie71]

I'll need to look these up. Alternatively, if you PN me a mail address in the EU I can send you a ready flashed ESP plus a 3.3 V Controller. You would then only need to find an arduino mini and a 433 MHz Module (any 5V Tx/Rx like the ones you have in your shop will do)

The ESP is an ESP12 module
Arduino mini
a 3.3 V Module
7805
1n4148
plus a handful of resistors
433 MHz Receiver / Sender optional