Pro-Troll E-Plug Scent Dispenser 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. E-Plug Featuresa Easy bait or scent loading and cleaning with the trap doora Has a unique patented designa Tapered front end provides powerful swimming actiona Also availabe in 2 pack unriggeda Scent holes on top and bottoma Built in EChip for additional electronic attraction