Features: 100% brand new and high quality Operating frequency range:88-108MHz This power amplifier can output 6W 108MHz maximum at 5V, current 1-1.5 A large power. High power, high efficiency, small size,with cooling heatsink for better performance. The high-frequency power amplifier must be connected to the nominal load before powering on to work (the product defaults to 50 ohms), such as a suitable antenna, this is very important Be sure to connect a serious antenna (that is, use a coaxial cable to connect to the outdoors, the antenna is Gp or J-shaped. Never use a whip antenna to connect directly to the output port, it will not work properly ) And this antenna should resonate- at the working frequency, and the standing wave cannot exceed 1.5. Package Includes: 1 PC x 88-108MHZ 6W VHF Power Amplifier Specifications: Operating Frequency Range: FM88~108MHz Size: approx 80x40mm/3.15x1.57in Input: 0.3~0.5W Output: 6W (see Test Data Sheet) Input And Output Impedance: 50 Ohms Input And Output Terminal: Sma-k Female (external Thread Inner Hole) Typical Gain: 10db Maximum Gain: 11db Supply Voltage: 12V (15V Max) Working Current: 1-1.5A note: You can only choose to work at 88-108MHz or 140-170MHz, and the two frequency bands cannot exist on one board at the same time. 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.