... , speed and pause; support Bluetooth stereo output Data Transfer: USB data wire/U disc/ Bluetooth (file transmission, stereo, remote ... by our QC department. Normally, the process of checking Mobile Phone is as follows:Functioning Test: Outlook, Calibrate screen, ... any other special function.3. Accessory Test: Battery, USB Cable, Earphone, Charger, TF card Warranty:All electronic products (famous brand ...