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: