XT4131A3.Display Instructionexternal powercover openWireless communication/set modeThe wireless communication or set mode&bluetooth mode below:paper feedingpaper lackingSymbolDescriptionbluetooth mode3.1 Wireless Communication/Set modeset modepower levelBluetooth paired,there’s a lockingsign. When the data is tranmitted ,it will flashHow to set,please read the sixth part