Manual:

Place the trap where it will be set up.
Tilt the spring 180°, hold it using the tensioner to slide it into the crampon, to do this, slightly lift the hinged plate. On the ground, place the swatter 20 cm or 30 cm from the wall (bait on the wall side). Lift the traps at least once a day, renew the bait to keep it fresh. If this fails, change their position, possibly use another bait.
A catch does not mean that the problem is solved (one rat can hide 20 or more!).
Keep out of reach of children and pets.