If the device does not turn on by inserting the jack, try charging it with a 5-volt charger of a phone or computer. If your device does not connect to the app, make sure you have accepted all the permissions requested by the app such as GPS location etc... and that you have turned on Bluetooth. Try also in order: ﻿﻿﻿﻿Turn off the device ﻿﻿﻿﻿Kill the app ﻿﻿﻿﻿Turn off the bluetooth, wait 5 seconds and then turn it on again ﻿﻿﻿﻿Turn on the device ﻿﻿﻿﻿Open the app and check if it works now, otherwise repeat the process If the problem persists, please contact support.