The HEM461B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 1000 MHz, Gain 23 to 24 dB, Gain Flatness ±0.75 dB, Noise Figure 3.5 dB, Output Power 10 to 10.5 dBm. Tags: Power Amplifier. More details for HEM461B can be seen below.