Antenna installation and repair; Computer installation and repair; Consultation in the field of repairing and maintaining home appliances; Electrical repairs and installation of computer hardware; Fire alarm installation and repair; Fire and/or burglar alarm installation and/or repair; Installation and maintenance of burglar and/or fire alarms; Installation and maintenance of irrigation systems; Installation and repair of air conditioning apparatus; Installation of computer networks; Installation of computer systems; Installation of electronic and digital connection to a call centre; Installation of security system; Installation of theft prevention devices; Installing satellite dishes; Interference suppression in electrical apparatus; Machinery maintenance and repair; Maintenance and repair of computer hardware; Maintenance and repair of computer networks; Maintenance and repair of telecommunications networks, apparatus, and instruments; Maintenance of alarm systems; Maintenance of computer hardware; Repair of damaged computers; repair or maintenance of computers; Repair or maintenance of fire alarms; Repair or maintenance of measuring and testing machines and instruments; Repair or maintenance of office machines and apparatus; Repair or maintenance of optical machines and instruments; Repair or maintenance of telecommunication machines and apparatus; repair or maintenance of telephone apparatus; Satellite dish installation and repair; Telecommunication wiring; Telephone installation and repair; Tinkering; Updating of computer hardware; Upgrading of computer hardware