| Model number | B660 |
| Defend Grade | IP65 |
| Keys | 16 keys |
| Vandal resistant | IK09 |
| Electrical lifetime | > 5 years |
| Contact resistance | 200 ohm (max) |
| Current Rating | appr. 45mA |
| Power supply | 3V DC |
| Led color | option |
| G.W. | 0.200kg approx |
| Dimensions | 82.1mm *70.4mm*14.2mm |
| Frame/keys materials | Zinc alloy |
| life span | ≥500,000 |
| Elasticity of key | 2.5-3N |
| Key Stretch | 180-200g |
| Contact resistance | ≤100Ω |
| Atmospheric pressure | 60-106Kpa |
| Operate Temperature | -25~+65℃ |
| self-service library | self-service kiosk | CNC machine |
| household applications | oiling machine | charge spot |
| industrial telephone | ATM | access control |
| ticket machine | vending machine | medical facility |
| security system | fingerprint attendance machine |

