1. Observe the appearance of products
Shell without cracking, burr, deformation, scratch, shrinkage, stains. Shell gap fit well, no loose phenomenon, good stereoscopic property.
2,Observe metal accessories
Metal parts no oxidation, mildew, stains phenomenon, plug no loose, deformation, plug force is suitable, firm.
3, check the key and booth
The key pressure is suitable, the shell is not stuck, the socket is stable, the pressure is suitable, the insert memory card is not loose.
4,Check screen printing, lettering and dyeing
Shell screen printing clear, no typos. Highly consistent. Clear lettering without burrs, clean writing. Dye evenly do not fade, color sense comfortable.
5, integrity
The product gives a person the feeling whether the craft is good, high-grade, the appearance is good. Is the volume reasonable compared with similar products
There is no prompt sound or display screen prompt, the function is clear, do not see the manual can use the product immediately in fact the same kind of products do not have the function of the standard 10 meters about 2 meters constant pitch is very good, good, good, general, 5 levels of the loudest not obvious distortion, bad vibration is not obvious