The HE550B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 600 to 1000 MHz, Gain 24 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 HE550B can be seen below.