1、Full Automatic Unattended Charging: Solar panel charge controller has overload, overheating, reverse current protection (to prevent the battery from pouring back to the solar panel in cloudy days or when there is no sunlight at night). 2、Increase Charging Current: Compared with traditional PWM controller, MPPT solar charge controller's charging efficiency can be improved by 10‑30%. 3、Overcharge Protection: When the battery is fully charged, the charging current will decrease, and when the battery is dead, the battery will be charged immediately. 4、With Bluetooth Function: You can view controller parameters through mobile phone APP display (you need to purchase a separate Bluetooth adapter). 5、Multi Protection Function: MPPT solar charge controller has load output function, over discharge, overload and short circuit protection function. Item Type: Solar Controller Material: Aluminium Alloy Color: As Pictures Shown Weight: Approx. 688g / 24.3oz Battery Voltage: 12V 24V Automatic Adaptation Battery Type: Colloid, AGM, Lithium Iron Phosphate Charging Technology: MPPT Product Size: Approx. 14.8x13.1x4cm / 5.8x5.2x1.6in 1 x Solar Controller 1 x Manual