Connect the clamps to the correct terminals Select mode to suit battery type shown on the LCD Screen LCD will show battery charge in 20% bars Charge bars flashing indicate charging Charge completed when LCD shows 'FUL' Charger will enter maintenance mode Mode press for normal modes: 12V Standard Lead Acid 12V AGM/C AGM and Cold Charging 12V Deep Cycle Gel 12V LFP LifePo4 Lithium Press and hold mode button for additional modes: 6V standard - 6V Lead Acid Power Supply - Can be used to power 12DC devices such as mini air compressor (3A Max Current) or as memory saver for car battery swap. Ultra Safety Built In: Short Circit Protection Reverse Terminal Protection Low and High Voltage Protection Overcharge Protection Over Temp Protection Over Current Protection In the Box: 4 Amp Battery Charger Clamps Extension M8 Eyelet Extension User Manual Battery Charger: Capacity: 4 ~ 120Ah 12VLFP Charge: 14.6V DC / 4A 6VSTD Charge: 7.2V DC / 2A