Features: Brand new and high quality Usage Requirement: Our board for the power module peripherals circuitry, with for RA M, S modules to work properly. The RF amplifier board is mainly developed for 1-5W handheld walkie talkie, with automatic transceiver conversion circuit. Increase the transmit power of the walkie talkie to have the power of the car radio, and the communication is farther and voice is clearer. Before installation, you should prepare a heat sink with an area larger than board, the thickness is recommended to use more than 25mm/0.98in. RA series module must detach all pins from board before debugging, wait for the voltage adjustment before welding all pins. Specifications: Material: PCB Input Power: 1-5W Output Power: 10-80W (Determined By the Installed Module) Input Voltage: DC12-13.8V Operating Frequency: 136-170 400-470 (Determined By the Installed Module) Insertion Loss: -1.5DB VSWR: ≦1.5 Size:Approx.94x50x1.6mm/3.7x1.96x0.63inch Package Includes: 1x RF Power Amplifier Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.