400W 8-Band Handheld UAV Jammer This 400W 8-band handheld drone jammer is a high-power portable UAV countermeasure system designed for military units, law enforcement, prison security, and bomb disposal teams. It delivers 50W per band across 8 critical frequency bands, effectively disrupting GPS navigation, remote control links, and video transmission of commercial drones such as DJI Phantom 4, Phantom 3 Professional, Advanced, Standard series, Inspire series, and other UAVs.