This is a X2 Prototype of the Switch Joy-Cons, A small number of these prototypes were produced in  november 2015, They have some differences compared to the final version such as:

1. The Screenshot button is shaped like a camera
2. The Player LED lights are rounded instead of squared
3. The side buttons say L and R instead of SL and SR
4. The Pair button is red.
5. The Prototype can not connect to a retail unit