The assembly can be done in 2 minutes without using any screws or glue.
The first step is to attach the legs to the back. This is done by inserting each leg, then twisting it 90 degrees to lock it in place.
Now insert the shaft of the quartz movement into the front, tightening it into place using the included nut.
Now attach the hour and minute hand onto the shaft. Once the hands are attached move them both to midnight and then set the correct time using the dial on the back.
If you want you can add a minute hand to the clock as well. To do that take the red second hand that comes with the quartz movement and cut it down to a length that fits the clock.
Insert the front part into the back of the clock. Remember to twist the front legs to such an angle that the prongs on the front can pass through.
In the final step you fixate the front to the back by rotating the front legs approximately 15 degrees as seen in the image. This will put part of the legs behind the prongs attached to the front, making the case impossible to disassemble. To detach the front you need to turn the legs to their previous position.
Remember to avoid using force when twisting the legs, or else the prongs on the front might break.