... tactility, abrasion resistant, installation and connection convenience. 4. Tightness is good, moisture-proof, dust-proof, waterproof, anti-oil, anti ... are guaranteed without any intermittent problem.7. Customized specification is available and keys can make different shapes.The main ... or without metal domes 5. Water-resistant, dust-proof, gas-proof and scratch-resistant 6. Long life cycle. Electronic ...