The aluminum shell of the fuselage adopts a sliding assembly design. When the rangefinder falls to the ground or hits a hard object, there may be a small probability of causing damage.
The aluminum shell is misaligned with the body, causing the keys to get stuck.
You can try to push the aluminum shell flat with your hands and reset it (the aluminum shell and the fuselage are pushed flat). If it is not flat by hand, you can put the protruding part on the
Press the flat button on the desktop and the button will return to normal.