1.PC button plus contact plate, high performance, cost-effective. 2. Adopt flame retardant material, including silicone waterproof ring, safety guarantee. 3. Solid and reliable, stainless steel shell anticorrosion and dustproof, high quality and low price.Electronic equipment: such as computer, monitor, keyboard, mouse, scanner, printer, etc. Communication equipment: such as mobile phones, telephones, routers, switches, etc. Automotive electronics: such as vehicle navigation, audio, air conditioning, etc. Medical equipment: such as electronic sphygmomanometer, electrocardiograph, ventilator, etc.