HOW CAN I SET MY DPI AS DEFAULT WITHOUT THE NEED TO HAVE THE RAZER SYNAPSE APP

Hi! You'll need the Synapse app to modify your default DPI. Depending on what mouse you have, you may be able to switch DPI stages by clicking the DPI button. Some of Razer's mice also support on-board profiles. That means you'll be able to save these settings directly onto the mouse! If you can't install Synapse on your current computer and you have a mouse with on-board storage, I'd suggest finding a friend that can install Synapse, and configuring your mouse on their computer.