This new design without visible screws is more aesthetically pleasing, however it is important to be aware that they must be installed into a recessed single gang UK metal or plastic back box with a minimum depth of 16mm. Unlike the previous design, they are not compatible with surface mounted back ..
NOTE If your module has a P on it then you will need to order an 0919P. The P stand s for pulse mode used with a Vertical Blind or 8800 skylight blind system..