It is normal, the #4 socket is reserved for factory debug purpose only, just disregard it.
It is for updating firmware, nothing need to do, we will inform you when we have new firmware ready.
It is normal that the control module beeps when it connects to power the first time.
Yes TL105 support two door open modes - NORMAL / FAST. It is simple to switch between them, just hold the control button in the gate until you hear Bee Bee Bee Bee Bee alarm five times.
Yes it can be operated manually even the electronic parts are not functional.
The liftgate can afford 150kg max, it actually depends on vehicles as our kits are designed per different gate weight. Read more in TL105 testing report.
TL105 can work in -30 celsius, we tested -30 ~ +65 without problem. Read more in TL105 testing report.
TL105 tailgate lift system is water proof indeed.
All cables are designed as plug-n-play, harness adapters included, no need to cut wires. In situation the car do not have factory reserved holes for dash buttons and pole cables, you will have to drill holes for mounting button and routing pole cables, otherwise your car is kept untouched.
Yes there is an installation manual included with product, you can also request an electronic PDF copy by e-mail.