Got a pic of said item ?A simple effective hornet trap
Take a one and a half or two litre plastic water/coke bottle, cover the bottom 2/3 with duct tape. With a sharp knife make a horizontal cut half way up the bottle 5 cm long. at both ends of this cut make vertical cuts 1 cm long. bend the flap formed in at an angle of about 45 degrees (like an upsidedown letter box flap). Prick a dozen small holes near the cap (to release the scent)
Bait - I find a splash of strawberry fruit syrup (any sweet juice) a splash of cider vinegar, water to make 3" deep, then add a chopped up banana skin!!
Both wasps and hornets are attracted by the scent and eventually find the "letterbox" flap and enter the trap, once in they head for the light at the top of the bottle, they tire and fall into the bait and drown Bees totally ignore these traps. Empty and re-bait at least weekly. Good hunting.