Scientific, electric, measuring, signaling, checking and teaching apparatus and instruments, namely, distance measuring apparatus, tape measures, laser distance meters, sonar equipment and parts thereof, gravity measuring instruments, bubble levels, level measuring machines for surveying, accelerometers, gyroscopes; Sound recording and sound reproducing apparatus and instruments; data processing equipment and computers; loudspeakers; MP3 player audio speakers; Light emitting diodes (LEDs); LED displays, lamps, flashlights; modules, namely, integrated circuit modules, photovoltaic solar modules for production of electricity, microphone modules, voltage monitor modules; electronic LED signals; alarm monitoring systems incorporating LCD or LED; solar battery chargers, solar batteries for domestic use; electronic equipment which works using sustainable energy, namely, electronic display boards, electronic display screens, electronic book reader, electronic computers, electronic pocket translators, electronic scoreboards, electronic signs, electronic timers; solar calculators, solar dynamo radios; apparatus and instruments, for generating, storing and distributing solar energy and power, namely, solar cells, solar panels for production of electricity, solar wafers; backpacks, protective cases, protective covers and holders adapted for carrying and storing laptop and net book computers, photographic, audio or video apparatus, smart phones, electronic personal organizers, CD/DVD players and recorders