When evaluating a drone jammer gun, the most critical factor is the frequency band coverage. Ensure the device supports common civilian frequencies such as 2.4GHz, 5.8GHz, and GPS (L1/L2/L5). For advanced security needs, look for units that also cover 900MHz and 1.2GHz. Additionally, verify the effective jamming range, which should typically span from 500 meters to 2 kilometers depending on environmental conditions. The output power (Wattage) per channel is also vital; higher wattage generally ensures a more stable disruption of the drone's signal.