It specifies whether the current transmit power settings of the AP can be 
changed. If it is selected, the settings cannot be changed. 
It specifies whether to use long preamble or short preamble. A preamble is a 
group of bits located at the beginning of a packet to enable a receiver of the 
packet to perform synchronization and prepare for receiving data. 
By default, the Long Preamble option is selected for compatibility with old 
network adapters installed on wireless clients. To achieve better synchronization 
performance of networks, you can select the Short Preamble option.