A spraying device includes a control handle, a first hollow barrel, a second hollow barrel, a driving unit, a spraying tube, and a liquid ejection tube. The powertrain includes an engine and a motorgenerator, which may be a single motorgenerator in a strong or full hybrid, but is not limited to such. All computer system resources, including processors are operatively dependent on the present invention; processors do not execute operating system instructions. The device includes hardware andor software for performing the described method. A selection unit selects a further page, a marking unit marks the further page to obtain a marked page, and a providing unit provides new generation information based on the determined generation information. The laser scanner includes a light source with a laser diode, a polygon motor with a polygon mirror mounted on a rotating shaft thereof, scanning lenses, a BD detection device, and a scanner casing with the BD detection device being held thereby and received therein.