Feature:1. EFFICIENT SOLAR POWER CONVERSION: This charger enables the conversion of solar panel or photovoltaic device power into rechargeable batteries, ensuring efficient utilization of solar energy.2. EASY TO USE: Simply insert the solar panel into one side of the solar charger and connect the battery to the other side to start the charging process.3. MPPT FUNCTION: Equipped with MPPT function, this battery charge control module ensures optimal power generation from the solar panel and comprehensive charging management for single cell lithium battery.4. CHARGING MANAGEMENT: The constant current charging current can be set using an external resistor, the trickle charging is used for batteries with deep discharge.5. HIGH PERFORMANCE: With a charging current of up to 2A, a PWM switch frequency of 300KHz, and a constant voltage charging voltage of 4.2V1%, this charger offers high performance charging.Specification:Item Type: Solar Charge Controller BoardMaterial: PCBInput Voltage: 6VFeatures:Output Voltage: Nominal 3.7V full stop voltage 4.2V lithium battery, single series lithium battery charging managementInterface: 2Pin PH2.0 JSTMaximum power point tracking function of solar panelComplete charging management for a single lithium batteryCharging current up to 2APWM switching frequency: 300KHzConstant voltage charging voltage: 4.2V 1%The constant current charging current is set by an external resistorTrickle charging for batteries with deep dischargeAutomatic recharge functionIndication of charging status and charging end status.Package List:1 x Solar Charge Controller Board2 x Connection Wire