The HEM372B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 500 MHz, Gain 19 to 21 dB, Gain Flatness ±0.5 dB, Noise Figure 2.2 to 2.7 dB, Output Power 9.5 to 10 dBm. Tags: Power Amplifier. More details for HEM372B can be seen below.