private void chbxCharger_CheckedChanged(object sender, EventArgs e)
 {
     if (chbxCharger.Checked)
     {
         phone1.PluginDevice(powerbank)
         .ExecuteDevice <PowerBank>((i) => { progressBar1.Value = i; });
     }
     else
     {
         phone1.DisconnectDevice(powerbank);
     }
 }