Description This Solar Battery Charge Controller automatically manages and regulates the voltage and current going into the battery from the solar panel, and it's designed with timer in order to ensure that the batteries are not overcharged. Features - Color: White- Size: 13.2x6.9x3cm/5.1x2.7x1.1inch- Material: ABS- Support charging Lead acid, Lithium-ion and Lithium iron batteries.- Digital display, easy to adjust the settings you need.- Built-in timer for more flexible control.- A great gift for your friend and family.- Note: can only use photovoltaic panel as power source. Specification - Rated voltage: 12V or 24V current 20A- Max solar input: 23V(12V) 46V (24V)- Battery type: B1 Lead acid 12V/24V auto; B2 Lithium-ion 3 strings 3.7V=11.1V; B3 Lithium iron 4 strings 3.2V=12.8V- Equalization: 14.4V(B1) 12.6V (B2) 14.6V (B3)- Discharge cut-off: 10.7V(B1) 9V (B2) 10V (B3)- Discharge recovery: 12.6V(B1) 10.5V (B2) 12V (B3)- Working temperature: -35 -+ 60 - Open light voltage: Solar panel 8V (light on delay)- Close light voltage: Solar panel 8V (light off delay)- USB output: 5V 2.5A maxPacking list: 1 x solar controller