The HEM394B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 1000 MHz, Gain 15 to 16 dB, Gain Flatness ±0.5 dB, Noise Figure 4.5 dB, Output Power 15 to 16 dBm. Tags: Power Amplifier. More details for HEM394B can be seen below.