The HEM388D-2 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 20 to 600 MHz, Gain 21 to 23 dB, Gain Flatness ±0.5 dB, Noise Figure 0.8 dB, Output Power 19 to 20 dBm. Tags: Power Amplifier. More details for HEM388D-2 can be seen below.