Buying Tips: The battery-free version requires Bias-Tee bias power supply. Some devices have their own bias power supply function This product is a high linearity, ultra-low noise gain block amplifier! type:gain amplifier Power supply:5V 70ma Frequency range:100K-6GHz 50 ohm input/output Connector:SMA female Weight:46g Power Suplly:A:with 3.7V 300mAH battery Colour:As Shown Material:Metal Size:45x45x18.5mm(excluding joints) Package Contents: 1 * gain amplifier 1 * cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Ultra-low noise figure,0.4 dB at 1.95 GHz High gain at 1.95 GHz,20 dB gain High linearity,+35 dBm output IP3 Stable performance High input power robustness,+22 dBm CW