V51 A Style IP67 Waterproof 4G LTE 3G 2G GSM Elderly SOS Button Emergency Alarm GPS Tracker For AsiaEuropeAfricaAustralia Feature 1. Real-time positioning: query position information and adjust positioning interval, and navigate to find personnel. 2. Historical track: View the movement track of any day within 90 days 3. Fence: GPS fence: Compare the GPS positioning data and judge whether there is an alarm for entering or leaving the fence. WIFI fence: Compare the WIFI hotspots and judge whether there is an alarm in or out of the fence. " 4. Health: Calculate the amount of exercise, calorie consumption and exercise journey. 5. Call: SOS 2 Voice Call Voice Monitoring: Request tracker to dial SOS number for voice monitoring 6. Command setting: make relevant settings for the positioner, for example: SOS number setting Phonebook to enter the number to call fall alarm alarm clock reminder Ringtone Finder Locator reject calls from strangers 7. Message list: Displays all alarm lists of the locator, including offline, low battery and entry and exit of the electronic fence, etc. 8. Reminder settings: Open all to receive an alarm push. Please be sure to enable the relevant push permissions in the app permissions of your phone Function GPS: 1. Chip model: TD1030 2. GPS signal: L1, 1575.42MHz CA code 3. Number of GPS channels: 22 channels 4. GPS chip receiving sensitivity: -165dBm, capture: -148dBm 5. GPS positioning accuracy: 5-15m 6. GPS Antenna: Ceramic Antenna 7. AGPS: Support 8. AGPS fast positioning time: 26 seconds for cold start LBS positioning accuracy: 100-1000M (based on AMAP database) WIFI: only support RX WiFi chip model: built-in WiFi standard: 802.11b\802.11g\802.11n WiFi positioning accuracy: 5-50M (according to AutoNavi or Google data) Parameter 1. Battery capacity: 1000mAh 2. Average standby current: 4mAh 3. Average operating current: 8mAh (positioning once every ten minutes) 4. Working temperature: -20~70 degr