HYA-1721-12N-F HYA-1721-12N-F can be used in indoor and outdoor settings. HYA-1721-12N-F is made in Taiwan and comes with QC reports. The frequency is between 1.71-2.17GHZ, and it is compatible with GSM1800 2G GSM1900 2.5G GSM2000, 3G & 3.5G. It can be mounted on an outdoor wall. HYA-1721-12N-F comes with different types of mounting kits, N male connector, small quantity order is acceptable.