Are there days you wish you could reach out to your children when they’re away from you? Let them know your are thinking of them by hiding a Knock Knock Opener™ in their back pack or tucked in a text book. And on the back, there’s a place to write a love note. The children all around will chuckle when the secrets are revealed. Not only will you feel connected but your children will laugh with Surprise and Delight!™