Portable Black Handheld Low-Flying Drone Signal Suppressor This black, lightweight, and easy-to-carry device is ideal for securing exam venues and outdoor areas. It discreetly blocks unauthorized drone intrusions while cutting off Bluetooth and Wi-Fi signals used for cheating. Compatible with mainstream DJI drones, it delivers directional suppression coverage of 100-300 meters. 3-8 customizable frequency bands cover drone control links, Wi-Fi, Bluetooth, 2G/3G/4G/5G, and