Hign-concerned Chemical: NoneAutomatic sleep: Nauto-pause: NExternal devices: YCharging Interface Type: otherBootpasswordSystemunitswitch(km/hormph)AssistLevelControlandDisplayBatteryindication:batterylevelpercentage,lowvoltageindicationSpeeddisplay:(inkm/hormph)Distance:single-tripdistance(TRIP),totaltraveldistance(ODO)AssistModeControlandDisplay(3/5/9levels)WalkassistmodeFrontlightindication:frontlightstatussupportedbycontroller.ErrorcodeindicationRidingInfo:BrakingStatus,FrontLightStatus,Cruise,LowVoltage.TurningSignals:Thisfunctionworkswithcontroller.DualDriveControlandDisplay:Thisfunctionworkswithcontroller.StatusofDoubleBatteryPacks:optional,workswithcontroller.NFCFunction:optional.BluetoothConnection:optional,supportOTAupgradeviamobilephoneConnection Mode:Red: Positive line of power supply;Blue: Electric door lock;Black:Negative line of power supply;Green:Instrument reception;Yellow:Instrument transmissionColor: BlackMaterial: plasticPackage Contents:1X Vertical anti-glare Cycling speed meter KitOnly 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.