Cell Lithium Battery Charging Solar Panel Regulator Controller Module. Features: Trickle Charging of Deeply Discharged Batteries Automatic Recharge Charge Status and Charge End Status Indication Soft Start Battery Overvoltage Protection Solar Panel Maximum Power Point Tracking Complete Charge Management for Single-cell Lithium Batteries Specification: Input Voltage: Select the Corresponding Module According to the Nominal Voltage of the Solar Panel (6V/9V/12V) Output Voltage: Nominal 3.7V Full Charge Voltage 4.2V Lithium Battery Interface: 2-pin JST Connectors (or PH2.0) Max Charging Current: 2A PWM Switching Frequency: 300KHz Charging Voltage: 4.2V 1% Working Environment Temperature: -40 C to +85 C Size45X20X9.5mm Package Included: 1 X CN3791 MPPT Solar Panel Regulator Module . We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.