RAZER™ VIPER V2 PRO Congratulations on getting your Razer Viper V2 Pro connected. Have fun exploring the following features: Calibrate your sensor’s lift-off and landing distances by up to 26 levels using Asymmetric Cut-off for a greater level of precision. With up to 5 programmable buttons, enable Razer Hypershift technology to double the number of customizable buttons for extended control. Streamline your setup, and free up a USB port by connecting your mouse to a compatible Razer wireless keyboard with the Razer Multi-Device dongle.