Housing having fixing mechanism

A housing having a fixing mechanism, for holding an electronic device, the housing comprising:

• a housing body, having a front plate;
• and
• a fixing mechanism, including:
• a first positioning device, rotatably connected to the housing body and configured to rotate around a rotation axis R, wherein the first positioning device has an accommodating portion, the accommodating portion has a wall surface, and
• a second positioning device, received in the accommodating portion of the first positioning device, wherein the second positioning device has a first fixing member for accommodating the electronic device and a second fixing member connected to a side end of the first fixing member to fix the first fixing member and the electronic device in a first position or a second position on the first positioning device,
• wherein the second fixing member is detachably engaged with the wall surface of the first positioning device to fix the second positioning device in the first position on the first positioning device, and a front end of the electronic device extended outside the front plate of the housing body;
• wherein the second fixing member is disengaged from the wall surface so that the second positioning device with the electronic device are moved and fixed in the second position on the first positioning device, and the front end of the electronic device is separated from the front plate of the housing body, whereby the first positioning device and the second positioning device with the electronic device are in a rotatable state relative to the housing body about the rotation axis R.