This is a 30watt fixed coaxial attenuator with SMA male-to-female connectors. It is a unidirectional attenuator, with the male connector as the input port and the female connector as the output port. It performs excellently within frequencies up to 3GHz and is commonly used with precision instruments such as spectrum analyzers, power meters, signal generators, and power amplifiers. With outstanding heat dissipation capability, it effectively protects your instruments and enhances system stability.