Features: 1Full 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). 2Increase Charging Current: Compared with traditional PWM controller MPPT solar charge controller's charging efficiency can be improved by 1030%. 3Overcharge Protection: When the battery is fully charged the charging current will decrease and when the battery is dead the battery will be charged immediately. 4With Bluetooth Function: You can view controller parameters through mobile phone APP display (you need to purchase a separate Bluetooth adapter). 5Multi Protection Function: MPPT solar charge controller has load output function over discharge overload and short circuit protection function. Specification: Item Type: Solar ControllerMaterial: Aluminium AlloyColor: As Pictures ShownWeight: Approx. 688g / 24.3ozBattery Type: Colloid AGM Lithium Iron PhosphateCharging Technology: MPPTProduct Size: Approx. 14.8x13.1x4cm / 5.8x5.2x1.6in Package List: 1 x Solar Controller1 x Manual