Boot password. System unit switch (km/hormph). Assist Level Control and Display. Battery indication: battery level percentage, low voltage indication. Speed display: (inkm/hormph). Model:-M818X Lithium battery No. 2 protocol 4-inch large screen, light sensing function, NFC card switch Working voltage: DC24V/36V/48V/60V/72V Rated working current: 12mA Leakage current: Less than 1uA Screen size: 4.0Inch LCD Working temperature: -20- 60 Storage temperature: -30- 70 Distance: single-trip distance (TRIP), total travel distance (ODO). Assist Mode Control and Display (3/5/9 levels). Walkassist mode Front light indication:front light status supported by controller. Errorcode indication Riding : 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 phone Type:Waterproof Connector Colour:Black Material:Plastic Package Contents: 1 * bike LCD Display Only 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.