Switch - Controller - Wireless - Joy-Con (L/R) - Neon Blue/Neon Yellow (Nintendo)
 
The Joy-Con charging grip allows you to combine the left and right Joy-Con into one larger conventional controller with this handy grip.
It also lets you keep playing while you're charging your Joy-Con, so you don't have to miss a minute.
Nintendo Joy-Con Charging Grip, Nintendo Switch: Attach the Joy-Con for conventional gameplay
Can play while Joy-Con is charging A confortable grip for long play sessions