Feature:1. Flame Retardant Material: The shell is made of ABS flame retardant material, insulation, flame retardant, and high temperature.2. LCD Digital Display: LCD digital display voltage, current, temperature, and battery capacity in real-time, convenient to read.3. Intelligent Current Voltage Adjustment: Intelligent adjustment of current and voltage, automatically stops input current after fully charged.4. 3 Stages Charging: Constant current charging, constant voltage charging, floating charging. Pure copper transformer, stable output, high conversion rate, energy saving, large capacity, etc. Overcharge protection, short circuit protection, reverse connection protection.5. Universal Battery Charger: Suitable for 12V, 2AH to 20AH, lead acid or agm, gel battery. Universal for most types of car and motorcycle batteries, lead acid, AGM, gel, vrla.battery).Note:1. Not used for Lithium Battery2. The red clip is connected to the battery positive. The black clip is connected to the battery negative.3. If the LED color can't be changed from RED to GREEN, it means that the battery may be broken and you need to check if the battery is broken in advance4. For the battery if you don't use it for a long time or Lack electrolytes, the voltage will be much lower and the battery will easily get broken and the battery will not be charged anymore.