This read-only object reports the total number of transmit power levels (between 1 and 8) that are available for wireless clients to use on a specific IEEE 802.11 interface. Different power levels allow clients to trade coverage for power consumption or interference management, and knowing the available options helps administrators and applications optimize performance. Operators reference this to understand the transmit power granularity supported by the access point, which affects client power management capabilities and interference mitigation strategies.