Features Widely Used For Digital Transmission: Amplifier allows widely used digital transmission, extension range, remote control and other power amplification and widely used. Reliable Work: High -frequency power amplifier can also work below 0.1W, and the output will increase with the input, and eventually reach the maximum power point. High -efficiency: The power amplifier module is very suitable for high frequency, such as RF, UHF, etc., the power amplifier board can improve work efficiency. Easy to Install: The design of the power amplifier is 4 x 5.5 cm compact size and lightweight weight, and the SMA K female head, which is very convenient for installation. Big Power: The power amplifier provides power from the 2PCS lithium battery. The maximum output can reach 39.2dBm 8.31W. Under the 8V volts below 433MHz, the current is 1.56A. Specification: Item Type: Power Amplifier Board Model: XR-109 Material: PCBA Operating Frequency: 400-460MHz Maximum Output Power (P1dB): 8.32W, 39.2dBm at 8V 1.56A, efficiency 66.6%.  6.76W, 38.3dBm at 7V 1.43A, efficiency 67.5%.  5.12W, 37.1dBm at 6V 1.26A, efficiency 67.7%.  Input Power: 20~23dBm, 0.1~0.2W, it can work below 0.1W, the output power will increase with input power increase, and finally get to the maximum power point.  Working Voltage: 5-8.4V (typical lithium battery supply voltage).  Working Current: 1.6A, maximum.  Input Impedance: 50 ohms Output Impedance: 50 ohms Input and Output Terminals: SMA k female head.  Module Size: Approx. 4 x 5.5cm / 1.57 x 2.17in (excluding protrusions) Power: 8V power supply, output 39.2dBm, 8.3W, efficiency 66.6%.  Package List: 1 x Power Amplifier Board Note: 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 50 ohms impedance. If it is connected with ordinary wires, it may not work normally, and there may be strange phenomena such as low output power and self excitation. 2. Due to the large output power, do not connect the antenna directly to the output port of the power amplifier. Please use a 50 ohm coaxial cable of no less than 2 meters to connect to the antenna to prevent strong signals from close range from interfering with the normal operation of the power amplifier. 3. This power amplifier is a one way power amplifier, which can only work in one direction. It cannot be used on equipment that needs to receive signals such as two way data transmission or walkie talkies. If there is anything you do not understand, please contact for confirmation. Package List 1 x Power Amplifier Board