Features: This board has an automatic transceiver conversion circuit, which increases the transmission power of the walkie-talkie so that thehandheld walkietalkie has thepower of the vehicle station, making the communication farther and the voiceclearer The productsare made of high-quality materials, and the quality is guaranteed It needs to be equipped with a power moduleto work normally This board is mainly developed for 1-5Whandheld walkie talkies, with an automatic transceiver conversion circuit to increase the transmission power of the walkie talkie. Before installation, prepare a heat sink with an area larger than the PCBboard, and it is recommendedto use a thickness of 25MM or more. Specifications: Input power: 1-5W Output power: 10-80W (determined by installed modules) Input voltage: DC12-13.8V Working frequency: 136-170/400-470 (determined by installed modules) Insertion loss: -1.5DB Standing waveratio: No more than 1.5 Size：approx 95x51x1.6MM/3.74x2.0x0.06in Package Includes: 1PC RF Power Amplifier Board note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.