Could this product harm hummingbirds?

No, the Disposable Yellowjacket Trap will not harm Hummingbirds, but if you have a Hummingbird feeders it can create some complications. Since they are an easily accessible source of food and water for insects, they will often be drawn to the feeders instead of the traps if they are hung near each other. Because of this, you will want to keep your trap at least 20 feet away from the hummingbird feeder.