The Hyperkin "Pupper" Controller Attachment for Switch 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 Joy-Cons; and an internal battery that charges your Joy-Cons while you are playing. You can also view the status indicators on the centerpiece to determine your Joy-Con's charging level and player number. Once done playing with your new pup, plug in your USB Type-C charge cable to recharge its battery. Use the stored power to charge your Joy-Cons 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 Joy-Cons charged and you focused on the game.