The RapidBAND uses 125 kHz proximity technology. It will work with most access control systems. This listing if for AWID 26Bit.  The RapidBAND is made of strong silicone rubber.  It can be applied or removed with ease.  It is waterproof and will withstand the rigors of daily use.  Customization and additional colors are available, but require a longer lead time and a higher minimum order quantity.  Large Size is 8.5" (74mm).  Medium Size is "8" (65mm).  Small Size is "7.5" (54mm).