Emergency call device integrating indoor and outdoor positioning

The utility model discloses a call-for-help device integrating indoor and outdoor positioning, which comprises a bottom plate, a metal middle frame, a main board and a shell, a display and a key panel are arranged on the shell, and the main board is provided with a main control module, an SIM card s...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	XING FENG, LOU XIZHONG, WANG HAO, PAN DEFU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALARM SYSTEMS ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING ORDER TELEGRAPHS PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING WIRELESS COMMUNICATIONS NETWORKS
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