The wristbands are used in the wrist and waterproof,there are two kinds of frequencies  to track the use .
One-off using:
1) Operating Frequency:13.56MHz or 125KHz
    2) Support Protocol:ISO—15693 or 14443
    3) Operating Temperature:40℃ to +70℃
    4) Data Maintenance:ten years,EMS memory can be wiped and written more than 100K times
    5) Read and Write Range:1cm to 10cm 
    6) 125KHZ Chip:EM4100, Hitag-1, Hitag- 2, Hitag-S, TK4100 
    7) 13.56MHz Chip: Mifare-One S50, Mifare-One S70, I-CODE, Ti 256, INSIDE 2K
    8) Specification: Length of 17 CM, 23CM(on request)
UHF  Frequency:
    1) Operating Frequency:860 to 960MHz
    2) Operating Mode:FHSS or fixed frequency
    3) Support Protocol:ISO18000-6C or ISO18000-6B
    4) Storage Capacity:512 or 96 bit(2K bit)
    5) Adapted Speed: ＜100 km/h
    6) Operating Temperature:-40℃ to +70℃
    7) Data Maintenance:>10 years,EMS memory can be wiped and written more than 100K times
    8) Read and Write Range:10CM to 2m