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| Adopted most advanced RFID card technique
Large storage capacity: 38,100 (ST-6655S) or 20,000 (ST-6655T) records
Interface: RS232, RS485, LAN and modem (decided by style)
Fast communication speed: 57,600 baud rate
Reading range: 8 to 20cm (decided by card)
Card number convertible into serial number, easy to memorize
Supports multiple network
Delivering the punch records simultaneously
Displaying personal details when punched (decided by style)
Outing management on working hour
Bell schedule
Built-in rechargeable battery for emergency
Communication way: RS232/485, LAN and USB
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