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 4.2V±1%, this charger offers high performance charging. Specification: Item Type: Solar Charge Controller Board Material: PCB Input Voltage: 6V Features: Output Voltage: Nominal 3.7V full stop voltage 4.2V lithium battery, single series lithium battery charging management Interface: 2Pin PH2.0 JST Maximum power point tracking function of solar panel Complete charging management for a single lithium battery Charging current up to 2A PWM switching frequency: 300KHz Constant voltage charging voltage: 4.2V ±1% The constant current charging current is set by an external resistor Trickle charging for batteries with deep discharge Automatic recharge function Indication of charging status and charging end status. Package List: 1 x Solar Charge Controller Board2 x Connection Wire