3. low votlage protection : for *8v battery as an example, when reach to low voltage *2+/*0.5v, the battery icon will shine , alarm you to charge for battery.

and when reach to top voltage such as *9v, the battery will be full.

usually for *2v, undervoltage proteciton is *2/*3v, high is *2v, 

for *8v , low voltage protection *1v,

*0v , low voltage protection is *2v, high is *0v. 

the tolerance is +/*0.5v

4.  WIRING

RED-power POSITIVE

green-power negative

blue-frontlight

purple-speed*-phase wire voltage signal, 

orange -left turning signal

light blue-right turning signal

that two black wire is voltage choosing wire, connected *0v such as, unconnected *8v. customer can have a try,

​one single yellow is for hallsensor speed, or one single red is for yxt speed, (this need made to order, default setting no this wire. )
 

5.   screen indicate

battery level,

speed,

voltage in digital,

trip,

frontlight.

ODO.

turning light left and right.

temperature(has temperature wire),tiny black wires are for temperature.

this picture bellow is taken when u connect battery only,