Boot password.System unit switch (kmhormph).Assist Level Control and Display.Battery indication: battery level percentage, low voltage indication.Speed display: (inkmhormph).Model:-M818XLithium battery No. 2 protocol4-inch large screen, light sensing function, NFC card switchWorking voltage: DC24V36V48V60V72VRated working current: 12mA Leakage current: Less than 1uAScreen size: 4.0Inch LCDWorking temperature: -20- 60Storage temperature: -30- 70Distance: single-trip distance (TRIP), total travel distance (ODO).Assist Mode Control and Display (359 levels).Walkassist mode Front light indication:front light status supported by controller.Errorcode indicationRiding : Status, Front Light Status, Cruise, Low Voltage.Turning Signals:This function works with controller.Dual Drive Controland Display:This function works with controller.Statusof Double Battery Packs:optional,works with controller.NFC Function:optional.Bluetooth Connection:optional,support OTA upgrade via mobile phoneType:Sm ConnectorColour:BlackMaterial:PlasticPackage Contents:1 * bike LCD DisplayOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.