Requierements:

The FLEX BLUETOOTH door handle is suitable for the following door dimensions:

• Door thickness: 34mm~63mm ( required extension adapter and M4 screws included).
  
  
• We recommend a minimum distance between the centre of your door lock and the door frame (backset) of 40mm so that the door handle does not touch the frame.
• You will need two 8mm holes to the left and right of the square, 38mm apart.

Instructions for measuring the required dimensions can be found here.

You need the Janus Lock app to operate and set up the door handle.