kha01: 1.big lcd display screen,128*64 lattice show, support chinese,english;2.can issue message at random time;supervise at real time, show the staff's name,number, picture, etc when he make attendance record;3.dog-guard circuit inside to strengthen the reliability and stability of the system;4.read card distance >12cm,read time<0.1; has rs232 commutator, needn’t to jump lines;5.with backup batteries,can work without power;can set the interval of the card-reading time;6.can register 5,000 staff, store 50,000 records. kh03b; 1.it can record 200,000 data that can be saved for 10 years;2.can work normally while power cut,and the data won?t be lost;has monthball batteries that can work 2-3days solely,they can be charged automatically;3.record data fast,just need less than 0.3s to record one data;modify its timing by hardware;4.big lcd displays the present time on the big lcd screen;modify its address by softwar;automatic maintenance mothball batteries;5.has usb connector, support rs232/485 commutator,don?t need to jump lines.6.to be used with attendance management software,achieve powerful function. kh03c: lcd shows the time;handle record fast;attendance records can be inquiried,computed and printed.