Supports input from 6V and 12V solar panels (in practice, 6V usually exceeds 6V, and 12V has a maximum of 18V). 3.7V lithium battery charging (cut-off voltage 4.2V). MPPT technology charging: real-time detection of the solar panel's power generation voltage, tracking the maximum voltage and current values.Complete charging management for single-cell lithium batteries .Trickle charging for deeply discharged batteries .Automatic recharge function . Charging status and end-of-charge status indication . Soft-start function . Battery terminal overvoltage protection . Lead-free product, compliant with RoHS, halogen-free.