This is a solo phone attachment for the Nerf Laser Ops pro Alphapoint laser guns. With this attachment, you can use the Nerf phone holder/armband to mount your smart phone to the end of your Nerf AlphaPoint blaster, and use it with the the single player mode in the Laser Ops Pro app. Solo play is needed to unlock various powerups for your Nerf AlphaPoint laser gun.
Hasbro no longer sells this separately. See the screenshot of the tweet.
This is an aftermarket adapter. Wiggly rubber Nerf armband/phone holder not included (you get that when you buy the blaster from Nerf.) This is not designed to protect your phone from falls.