Amazon offers the Nintendo Switch Neon Joy-Con Pair in Red/Blue for $79.99 with free shipping. Although that's list, it's the only store with stock at that price. (3rd-party vendors on Amazon and other sites charge $100 or more.) Both Joy-Cons can be used independently in each hand, or together as one game controller when attached to the Joy-Con grip. Each Joy-Con features an accelerometer and gyro-sensor.