This Faithfull compact 4Ah / 48 Watt maximum rated Battery Charger is designed for use with 12V lead-acid batteries, with a capacity of between 20 – 65Ah. An easy to read LED readout system indicates the battery's state of charge, making it simple to see when the battery is fully charged and ready for use. Also suitable for use as a battery tester. Not suitable for use with AGM or EFB type batteries used in vehicles with start/stop technology The charger has many safety features including: Thermal overload protection. Short circuit protection. Over current protection. Double insulation. CE approval. Specifications: Output: 4Ah / 48W. For Battery Type: 12V lead acid 20Ah -– 65Ah. Power Supply Voltage: AC 220~240V 50Hz. Output Voltage: DC 12V. Battery Capacity: 20Ah – 65Ah.