Input : 20~23dBm (0.1~0.2W), it can work below 0.1W, the output will increase with the increase of input , and finally reach the maximum . Working voltage: 6-8.4V (typical lithium battery supply voltage) Working current: 1.6A (Max) Input Impedance: 50 ohms Output Impedance: 50 ohms Input and output terminal: -k female (external thread inner hole) Operating frequency: 300-330MHz Maximum output (P1dB): 8W (39dBm)@8V 1.56A Efficiency 65% Notice: 1. Since it is in the UHF frequency band, there are certain requirements for the input and output cables, and the input and output are required to be coaxial cables with a characteristic impedance of 50 ohms. If it is connected with ordinary wires, it may not work normally, and there may be strange phenomena such as low output and -excitation. 2. Due to the high output , do not the antenna directly to the output port of the amplifier! Please a 50 ohm coaxial cable of no less than 2 meters to to the antenna to prevent the strong signal from interfering with the normal operation of the amplifier! 3. The amplifier output must be connected to a pure resistive load of 50 ohms. The antenna requires the standing wave is not greater than 1.5 to the transmission distance and the safety of the amplifier! 4. This amplifier is a one-way amplifier, which can only work in , and cannot be used on devices need to receive signals such as two-way data transmission or walkie-talkies. Material:PCB colour:Green Package Contents: 1 x High Frequency Amplifier Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.