To really understand the scope of power that these eyes have, one has to look at the unique abilities of the known Mangekyou users in Naruto. Itachi's Mangekyou Sharingan posesses two abilities ...

Sarada awakened her Mangekyo Sharingan, which resembles a sun, in chapter #79 of Boruto: Naruto Next Generations ... She will also get two unique abilities from each of her eyes, further ...

Following the collaboration with Naruto ... time to match the specifics and get the freebie. Here are further details on obtaining the free Gloo Wall - Sharingan Theme in Free Fire.