Household electronics Home automation 110 Home computer networks 60 Design and construction 31 Electronic apparatus and appliances 23 Maintenance and repair 12 Programmable controllers 12 Wireless communication systems 10 Home entertainment systems 8 Digital electronics 6 Electronic surveillance 6 Equipment and supplies 6 Mobile communication systems 6 Security measures 6 Web-based instruction 6 Audio amplifiers 4 Bluetooth technology 4 Digital communications 4 Digital television 4 Digital video 4 Dwellings 4 Electronic circuits 4 Global system for mobile communications 4 Recording and reproducing 4 Remote control 4 Solar cooking 4 Solar energy 4 Sound 4 Vacuum technology 4 Amateurs' manuals 3