ASROCK A520M-ITX/ac Manuel D'instructions page 91

Operations in the 5.15-5.35GHz band are restricted to indoor usage only.
Radio transmit power per transceiver type
Function
2400-2483.5 MHz
WiFi
Bluetooth 2400-2483.5 MHz
Frequency
5150-5250 MHz
5250-5350 MHz
5470-5725 MHz
Maximum Output Power (EIRP)
18.5 + / -1.5 dbm
21.5 + / -1.5 dbm
18.5 + / -1.5 dbm (no TPC)
21.5 + / -1.5 dbm (TPC)
25.5 + / -1.5 dbm (no TPC)
28.5 + / -1.5 dbm (TPC)
8.5 + / -1.5 dbm