Global system for mobile communications 51 Security measures 51 Electronic security systems 14 Mobile communication systems 13 Security systems 10 Automobiles 8 Home automation 8 Wireless communication systems 7 Anti-theft devices 6 Computer programs 4 Embedded Internet devices 4 Inventory control 4 Microcontrollers 4 Radio frequency identification system 4 Radio frequency identification systems 4 Safety measures 4 Universal Mobile Telecommunications System 4 Vehicles 4 Wireless LANs 4 Wireless sensor networks 4 Computer networks 3 Computer security 3 Arduino (Microcontroller) 2 Control systems 2 Data processing 2 Fire prevention 2 Gas leakage 2 IEEE 802.11 (Standard) 2 Industrial safety 2 Motorcycles 2