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RF-V13 GSM Real-Time Tracker & Smart Door Alarm Support Open / Close Door Alarm FunctionReal-time Mini GSM LBS Tracker GSM Tracking Device & Smart Door Alarm RF-V13 GSM real-time tracker & smart door alarm designed for home and asset location and communication. GSM quad-band network, LBS location. Support open / close door alarm, voice sensor alarm, vibration sensor alarm, voice monitoring, low battery alarm, and SIM changing alarm. Long time standby, perfect product for real-time monitoring the safety of home & property, guard property from violation. Main Features:- GSM quad-band network, LBS location- Website / IOS APP / Android APP / SMS multiple set and tracking- Open / close door alarm- Voice sensor alarm- Vibration sensor alarm- Voice monitoring- Low battery alarm- SIM changing alarm- Long time standby Specifications: Features:- GSM quad-band network, LBS location- Website / IOS APP / Android APP / SMS multiple set and tracking- Open / close door alarm- Voice sensor alarm- Vibration sensor alarm- Voi