N Male to SMA Male jumper cables are short interconnection coaxial cables designed to connect two components in an RF system. The most common use of this cable type is connecting a 4G device such as a repeater or modem into a wallplate. Another common use is to connect from an RF surge protector to the 4G device.
The larger N Male connector screws onto the wallplate or surge protector, and the smaller gold coloured SMA connector screws onto the 4G device.