Hign-concerned Chemical: None Automatic sleep: N auto-pause: N External devices: Y Charging Interface Type: other Bootpassword Systemunitswitch(km/hormph) AssistLevelControlandDisplay Batteryindication:batterylevelpercentage,lowvoltageindication Speeddisplay:(inkm/hormph) Distance:single-tripdistance(TRIP),totaltraveldistance(ODO) AssistModeControlandDisplay(3/5/9levels) Walkassistmode Frontlightindication:frontlightstatussupportedbycontroller. Errorcodeindication RidingInfo:BrakingStatus,FrontLightStatus,Cruise,LowVoltage. TurningSignals:Thisfunctionworkswithcontroller. DualDriveControlandDisplay:Thisfunctionworkswithcontroller. StatusofDoubleBatteryPacks:optional,workswithcontroller. NFCFunction:optional. BluetoothConnection:optional,supportOTAupgradeviamobilephone Connection Mode: Red: Positive line of power supply; Blue: Electric door lock; Black:Negative line of power supply; Green:Instrument reception; Yellow:Instrument transmission Color: Black Material: plastic Package Contents: 1X Vertical anti-glare Cycling speed meter Kit 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.