E-Plug Scent Dispenser , 2 pack, unrigged. Pro-Troll&';s new E-Plug high action scent dispenser with EChip features a hinged door with slots to release tuna or other bait scents. Pocket is easy to clean. E-Plugs work well behind the Pro-Troll 360 flashers or trolled by themselves. The action activates the embedded EChip. Designed by Chris Hopkins of River Tec LLC, the E-Plug has proven it&';s effectiveness in catching salmon throughout the Pacific Northwest and is endorsed by many professional guides.