How to explain the two power limits of 800/900MHz band?

A: The document (信部无【2007】205号) shows the following provisions about 800/900MHz RFID power:

840-845MHz/920-925MHz                   limit:100MW

840.5-844.5/920.5-924.5MHz              limit:2W

The two power limits is aimed at the equipment’s operating band, that means the maximum transmit power limit is only 100mw when the equipment’s frequency range is 840-845MHz/920-925MHz, and the maximum transmit power can reach 2W when the equipment’s frequency range is 840.5-844.5/920.5- 924.5MHz.