CRC9 is an adapter from SMA Female connector to CRC9 connector that allows you to connect antennas and cables with standard SMA connectors directly to the modem. The SMA type connector is used to connect a coaxial cable with a wave impedance of 50 ohms. It is highly reliable and robust. A CRC9-connector is a miniature version of a high-frequency connector. It is a 2.5 mm diameter pluggable connector, commonly used with various 3G and 4G modems. The package contains 2 adapter.