Battery capacity indicator use 4 LED, and PAS indicator 3 LED. There are 2 touch button on the panel, one is for power/headlight on and off, another one is for PAS/6 km/h cruise control. RS232 communication protocol connected the display and the motor controller.
Housing color: BLACK.
Battery indicator 4 LED: RED.
PAS 3 LED: BLUE.
When something is wrong with the electric system, the battery capacity indicator LED will close, and PAS 3 LED will flash both. The errors maybe: controller current abnormal, speed handle abnormal, motor wire broken, hall sensor (inner motor) abnormal, brake sensor error, or communication wire broken.