Real-time display of battery health, temperature, power and voltage. Automatic test of craking and charging system. Built-in alarm function. An alarm tone will sound due to abnormal body temperature, low battery, low voltage, startup system failure and charging system failure. The display is powered by lithium battery and solar panel, no cable, no installation required. Type-C fast charge battery can be used when the battery power is low. Adopt stable 433MHz wireless transmission technology. Built-in vibration sensor. The device will automatically turn on when the vehicle is driving, move a little, will automatically turn off after a long time to stop. Built-in fuse and reverse connection protection. Professional algorithm, the longer the connection time, the more accurate the result.