Modifications made by Licensee (see section 3.4.b in )

Rev 1
2 stackable boards, with primary (AC) side on botton board and secondry side (DC with arduino and radio) on top board. Using HLK-PM01 as AC/DC converter. 

-Converter 240v/120v AC to 5v DC (HLK-PM01)
-Arduino Pro Mini
-NRF24L01+ 

Rev 2
Complete new PCB layout, one board with primary side (AC) to left. New security components (0,3A fuse, thremal fuse, Varistor). Included MYSX 1.4 connector (https://www.mysensors.org/hardware/mysx) 

Rev 3 
- Larger distance/gaps for fuse and thermal fuse.
- Larger throughholes in PCB for fuse and thermalfuse
- Changed location (moved down and rotate 45dgr) for varistor and screw terminal block.
- Added a safety warning on silk
- Added logo on silk
- Added temp (dallas) for node temperature.
- Added small screwholes in corners to easy be able to remove them.
- Larger distance between AC and DC side (to avoid creepage)

Rev 3.1
-Larger creepage/clearance between AC and DC side
-Larger creepage/clearance between AC before and after fuses.
-Added label with license on board.
-Moved voltage regulator to increase distance to AC side
-Removed high voltate on silk screen
-Added holes between AC ciriut to decreace creepage
-Added lines on silkscreen to mark AC and DC gap.