The HE550A from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 500 to 700 MHz, Gain 25 to 27 dB, Gain Flatness ±1.25 dB, Noise Figure 0.9 dB, Output Power 3 to 5 dBm. Tags: Low Noise Amplifier. More details for HE550A can be seen below.