Can I also stick the COMPIT universal adapter onto a soft cover or directly onto the back of the smartphone? 07 February 2024 18:21 Updated No, the adapter only works with hard cases. Please never stick the universal adapter directly onto your smartphone, always use a hard case. Related articles Can I also use the +COM/CHARGER in the rain? How do I change the digital pressure gauge on my AIR-EXPLORER DIGI?