I had Great hopes for this unit. For the first 6 hours they were met. No unusual or unexpected troubles. However, after turning it off and leaving it for 20 hours, the unit would not restart. The LCD screen would not power on and the unit was dead. Vevor did not have a exact replacement in stock to exchange. Had to downgrade to a model without Bluetooth. Still awaiting arrival. What I can say about the Bluetooth is it's rather poor designed app. It doesn't have many features in the ones it does takes up more than a full screen so you're constantly scrolling.