BUY THEM FOR THE M30XS, NOT THE M50XS. I have no affiliation with the seller or manufacturer of this product wherever in China they may be and paid the listed price for both products. They are selling cheap Chinese products I think, as it is made in china only. La aplicación de corsair es poco intuitiva pero esta muy completa, inclusive puedes descargar perfiles personalizados en la pagina de corsair. This one has some variable frame rates on the sensor which is technically not flawless. None the less, they are incredibly comfortable and because they are lightweight and compact, they are wonderful for travel. Im using it for COD and it helps in detecting footsteps. Hardware related, no fault of the battery itself. love the resilience of the souls. Pulls you in where you want it to and does dig in or hurt anywhere.