The HES387B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 20 to 400 MHz, Gain 25 to 26 dB, Gain Flatness ±0.5 dB, Noise Figure 2.7 dB, Output Power 20 to 21 dBm. Tags: Power Amplifier. More details for HES387B can be seen below.