This is a very different mouse than the V551. The V570 Blackout is a larger, bulkier mouse with a 12k dpi laser sensor and a weight adjustment system. It is intended for FPS and MMO gamers and offers a plethora of buttons. In total, the Viper V570 Blackout features 13 programmable buttons. Compared with the V551, it also has more prominent RGB LED illumination.