SMA Male to SMA Male RF Cable Connector. Also widely used in low frequency devices to connect antenna for two way radio, audio, video, mobile radio and other test equipment. Mainly used in cell phone signal booster installation applications and other RF radar applications such as connecting antenna to small radios. It is particularly used due to a lot of current sales of the Chinese made Part 90 land mobile handheld radios and also used in the Amateur Radio (FCC Part 95) Radio Service. This M/M adapter has a center pin and external threads. Other connectors available are M/F, F/M, and F/F. For most routers, the antenna connector is a M/M for the F/F antenna. This SMA male to SMA male is well built and has very little RF loss.