The Quickshifter together with fuel/ignition control unit allows full throttle during the up shifting without enabling of clutch. This is done by momentarily cutting the fuel and/or ignition, which unloads the transmission. In that way the switching operation can be conducted faster and more confident.
Depending on the moving direction of the shift rod the pull or push version is required. Here you can find the list of motorbikes for which quickshifter is deliverable.