The HEM576B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 3500 MHz, Gain 11 to 12.5 dB, Gain Flatness ±0.5 dB, Noise Figure 2.8 dB, Output Power 19 to 20 dBm. Tags: Power Amplifier. More details for HEM576B can be seen below.