Aluminum Alloy Smart Bike Stem Support APP Anti Theft Alarm GPS Data Record With Powerbank.   Features:  1.Smart bicycle stem use with smartphone APP, to achieve real-time ride all-terrain data record.  2.Real-time GPS navigation.  3.Anti theft, sound and light alarm.  4.Owner returns automatically released.  5.With powerbank,can be used for lighting, mobile phone charging.  6.Cycling track and time record.  7.Show riding height, slope, ambient temperature, barometric pressure.  8.Riding displays real-time speed, and average speed, maximum speed.  9.Display consumes energy (calories).  10.APP interface including city,mountain,navigation and lighting control interface.  11.Riding local music player interface.  12.Cloud data backup,browsing history.  13.Friends riding a real-time positioning, can be seen riding friends bicycling directions, then do not worry about someone getting lost or left behind     Specifications:  Material: Aluminum Alloy;  Size: 95*31.8*26.8mm;  Color: Black;  Waterproof: IPX6;  Battery: Bike stem(800mAh), powerbank(3700mAh);  Net weight: Bike stem(330g), powerbank(145g);    How to install:  1.Remove the old bike stem, new bike stem corresponding to the installation, adjust the angle beam bicycle handle and tighten the screws.  2.install speed sensor,and fixed leads,connect to the host.  3.To open the phone APP, go to "Settings" menu, click "Bluetooth" on the search appliance and connect.  4.According to the app guidelines set wheel diameter.  5.The bicycle is placed on a level surface, click on the "horizontal correction" horizontal calibrated to give accurate gradient data.  6.Use a variety of functions according to APP interface instructions.    Alarm function:  1.After connecting the mobile phone equipment, flip to APP lighting page, click on the "theft" On anti-theft feature.  2.When the device is connected, automatically disarm the alarm.  3.When the phone is left, the device is disconnected more than 5sec on alert, there are Bi-Bi voice prompts.  4.Alert state,move bike 5sec will alarm twice wu-wu.  5. The bicycle continues to move more than 10 seconds, it will trigger continuous alarm tone and flashing lights.  6.When the phone is returned, the device is connected, automatic discharge alarm, exit alert.    Package included:  1 x bike stem;  1 x powerbank