The Hyperkin Pupper Controller Attachment for Joy-Con has an ergonomic design, which provides a curved grip for a more comfortable hold; secure and easy to slide in rails for your controllers; and an internal battery that charges your controllers while you are playing. You can also view the status indicators on the centerpiece to determine your controller charging level and player number. Once done playing with your new pup, plug in your Type-C charge cable to recharge its battery. Use the stored power to charge your controllers anywhere! Make your controller look like man's best friend and give him a smile just like Barko (3 puppy smile stickers included). Like a loyal companion, your trusty Pupper will keep your controllers charged and you focused on the game.