Dustproof, Water proof, Vandalism resistance, Shakeproof, PickproofMounting type: Rear MountingNo. of keys: 20keys, high quality stainless steel.Keyswitch Technology: Silicone switching elementkeyswitch lifetime: > 5 million of operations.Actuation Force/travel: 1N/0.45mmMounting Rack: Aluminum alloyLettering: laser engraved legends for excellent durabilityG.W. 0.75kg