High-frequency power amplifiers must be connected to the nominal load before they are powered on (the default for our amplifiers is 50 ohms). No-load operation damage the power amplifier, which is very important! Input: 1-10W Output: 180W (24V, 7MHz, 50 ohm load), 120W (13.8V, 7MHz, 50 ohm load) Operating frequency range: 3-15MHz, maximum power is around 7MHz, high-frequency gain drops significantly, do not use more than 15MHz. Output impedance: 50 ohms Supply voltage: 12V-24V Note: It's DIY kits, needs to finish by yourself., without input and output connectors, and without heat sink. The words and individual parts on the product may be slightly different due to different factory batches, but it not affect normal use. Colour:As Shown Material:PCB Package Contents: 1set x 180W HF linear high frequency power amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.