1,TM card DS1990A-F5
2,unique id number
3,imported stainless steel body
4,water-proof and rust proof

TM card DS1990A-F5 is most common one, it has main features as following:

Can Be Read in Less Than 5ms Operating Voltage Range: 2.8V to 6.0V, Working Temperature Range: -40¡ãC to +85¡ãC imported stainless steel bodywater-proof and rust proof