Check the listing for details. Original Optical Mouse Switch for Razer Viper Ultimate Mini Basilisk V2 Mouse. Condition: New. Listed at 8.99 USD. original optical mouse switch for Razer Viper ultimate mini Basilisk V2 mouse Optical micro switch/also known as optical micro switch (available in small quantities, while stocks last) Read before buying (important): 1. This model is a hot-swappable micro-movement, the original mouse is an optical micro-movement version, so it can be used universally. 2. The 1st and 2nd generations of optical micro-motion are universal, mainly because of the difference in lifespan and different hand feelings. 3. As far as we know, the following mouses are originally equipped with optical micro-movement versions:Viper mini, Viper wireless ultimate, Viper standard, Viper 8K, basiliskV2, basilisk ultimate version, deathadderV2, deathadderV2 PRO wireless version, deathadderV2 mini Package include: 2PCS Switch