Vcsel Light Source,Vertical Cavity Surface Emitting Laser,Visible Vcsel,Vcsel 1300Nm AcePhotonics Co.,Ltd. , https://www.cgphotonics.comRecently, some readers asked this reporter about the problem of keeping the refrigerator fresh, saying that the food stored in the refrigerator in the house turned out to be long hair. She was very surprised and asked if there was any better preservation method. Food also has the best preservation temperature into the store, and many consumers will find a high-temperature refrigerator with a temperature change box. Variable temperature box to