【Multiple security protection】The charger has multiple safety functions: fire-resistant flower, low-voltage protection, over-voltage protection, over-current protection, reverse connection protection, short-circuit protection, overheating, ensure your safety. The smart charger contains a fan, it prevents overheating during charging and extends the life of the car charger. 【Smart LCD display】The charger automatically recognizes the current voltage and does not require manual operation. The screen can display voltage, current, battery capacity, temperature, etc. It is possible to know the status of the state of charge of the battery. When charging, the red clip is used to secure the positive (+) black battery with the clip to secure the negative (-) battery. Automatically stops when charging is complete. 【Largely used】Suitable for lead acid batteries, batteries for 12V 6-150AH , 24V 6-100AH (AGM, GEL, WET, SLA, VRLA). Diagnose and repair battery issues and extend battery life. For cars,