... -jamming function6. Special anti-jamming software sytem: anti-jamming distance between two card readers is 1.5m.7. Voltage: 12V ... Weight: 1.5kg10. Dimenstion: 230*230*35mm11. Suitable for: Long distance access control system, attendance system, meeting signing in, automatic personnel ... check of production line, logistics, animal identificaiton management, etc. long distance Access Control Card Reader