For Panasonic electric assist bicycles: This is a speed limiter removal/speed limit cut board. * By removing the maximum speed restriction, the speed at which assistance is provided increases, allowing for more comfortable riding! * Easy installation! No soldering required. No special tools or knowledge needed. (Installation manual included, so even beginners can rest assured) * Minimal impact on the battery. No problems with normal use. Same-day shipping available, anonymous delivery, and secure transactions. * Please use on public roads at your own risk. -------------------------------------------------- Compatible Panasonic models: * ViVi series * Gyutto series * Compatible with many other models If you have any questions, please feel free to comment.