Cellular telephone systems Alarm systems 1 Cameras 1 Digital storage 1 Electronic equipment 1 Exploratory studies 1 Exponential growth 1 Global system for mobile communications 1 Global system for mobile communications (GSM) 1 Hardware structures 1 Home security systems 1 Housing 1 Infrared radiation 1 Issues and challenges 1 Mobile telecommunication systems 1 On-line banking 1 Passive infrared 1 Penetration rates 1 Performance risk 1 Quantitative study 1 Received signals 1 Residential areas 1 Security systems 1 Self-administered questionnaire 1 Short message services 1 Software parts 1 Surveys 1 Text messaging 1 Thermoelectric equipment 1