Features: brand new and high quality Large-screen LCD display, adjustable charge and discharge parameters, with power-off memory function. Use industrial-grade master chip. Complete 3-stage PWM charging management. Dual USB output, maximum current up to 25A, supports mobile phone charging. Dual MOS anti-backflow circuit, ultra-low heat. Built-in over-current, short-circuit for protection, open-circuit for protection, reverse connection for protection, all of which are self-healing and do not damage the controller. Specifications: Material: ABS Current Type: 10A/20A/30A/40A/50A/60A Size: Approx. 133.5x70mm/5.26x2.76inch System Voltage: 12V-24V Maximum Photovoltaic Voltage: 23V for 12V battery; 46V for 24V battery Battery Type: B1=Automatic identification of lead-acid battery 12V/24V battery B2=Lithium-ion battery (lithium battery) 3 strings 3.7V=11.1V B3=4 strings of lithium iron phosphate batteries 3.2V=12.8V Charging Cut-off Voltage: 14.4V(B1) 12.6V(B2) 14.6V(B3) Discharge Cut-off Voltage: 10.7V(B1) 9V(B2) 10V(B3) Discharge Recovery Voltage: 12.6V(B1) 10.5(B2) 12V(B3) Light Control Turn-on Threshold: Photovoltaic Panel 8V (light control turn on the light has a delay) Light control light off threshold: Photovoltaic Panel 8V (light control light off has a delay) USB Output: 2 USB Outputs, 5V/2.5A (maximum) Standby Current: <10mA Working Temperature: -35~+60°C Package Includes: 1x Solar Charge Controller note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.