1. When transmitting with an antenna, you should choose an antenna with a corresponding frequency standing wave ratio of less than 2.2. Be sure to connect a load to the output end before supplying DC power. If it works without load, the module may be .3. The power amplifier module is a bare module. It is not delivered with a cooling system. Buyers need to do the cooling themselves. The cooling system should not dissipate less than 20w.Technical indicators:1. Operating frequency: 1200MHz-1700MHz2. Input and output impedance: 50Ω3. Maximum input power: 3dBm@2mW4. Output power: 10W@DC24V, 12W@28V. For specific parameters, please refer to the measurement chart below5. Supply voltage: 24V-28V@24V is recommended6. Working current: 1.5A-2A varies with frequency and supply voltage7. Module connector: Both ends are SMA female (external thread inner hole)Note:Installation guide not included, we strongly recommend you seek professional installation.Please check as much as possible to make sure the item is what you need.Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UseColor:SilverMaterial:MetalPackage Contents:1 * RF module