Features 1、Reliable Work: Can also work below 0.1W, and the output will increase with input increase, and finally get to the maximum power point. 2、Greater Power: Powered by 2pcs lithium battery, the maximum output can get to 39.2dBm 8.31W at 433MHz under 8V volt with 1.56A current. 3、Broad Utility: Allows for extensive application on digital transmission, extended range, remote control, power amplification and so on. 4、Better Design: Suits perfectly for high frequency such as RF, UHF, etc., the power amplifier board enables a higher working efficiency. 5、Easy to Install: Designed to have 4 x 5.5cm compact size and a light weight as well as SMA K female head, very convenient to install. 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