1. Self-made algorithm,fast and accurate lock MPPT point,within 10 seconds,accuracy is greater than 99%,MPPT peck conversion efficiency 98%.2. Four-stage charging:high current charing at MPPT points,float charging,absorption charging,equalized charging.3.Used for lead-acid batteries/Gel batteries. Can be used for lithium battery(LiFePO4 battery,ternary lithium battery),when the lithium battery is low voltage protected,the battery can be activated.4. External temperature sensor,accurate temperature compensation. PV input maximum voltage:100V.5. The system voltage is 12V/24V automatically identification. Communication function(with built-in or external WIFI,Bluetooth,GPRS module),providing standard MODBUS communication protocol.Type: MPPT120D-WIFIMaterial: plasticcolour: black greyPackage Contents:1 x MPPT Solar Charge ControllerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.