1、Large LCD Display Screen: Display of charging and discharging current; Query of accumulated electricity generated and discharged; Temperature display; Optical control and delay control; The charging and discharging parameters are adjustable; With power off memory and other functions. 2、Dual USB Output: The solar charge controller supports dual USB output, maximum current up to 5A, supporting charging for iPhone. 3、Multiple Protection: Built in over current, short circuit protection, open circuit protection, reverse connection protection are all self recovery type, without damaging the controller. 4、Safe Charging: Adopt industrial grade main control chip, complete 3 stage charging management, anti backflow circuit, ultra low heat generation. 5、12V 24V Voltage Automatic Adaptation: Connect the positive and negative poles of the battery to the controller, and the controller will automatically detect the battery voltage. 1 x Solar Controller1 x Instruction Manual Item Type: Solar Charge ControllerMaterial: ABSGross Weight: 202g / 7.1ozProduct size: 12.5x10x3cm / 4.9x 3.9x 1.2inModel: K1688System Voltage: 12V 24V automatic adaptationMaximum Photovoltaic Voltage: 23V at 12V battery; 46V maximum at 24V batteryLifting Charge Voltage: 14.4V (12V), 28.8V (24V)Float Charging Voltage: 13.7V (default, adjustable) (12V), 27.4V (default, adjustable) (24V)Discharge Cut Off Voltage: 10.7V (default, adjustable) (12V), 21.4V (default, adjustable) (24V)Discharge Recovery Voltage: 12.6V (default, adjustable) (12V), 25.2V (default, adjustable) (24V)Charging Recovery Voltage: 13V (12V), 26V (24V)Light Controlled Light On Threshold: 8V for photovoltaic panel (with delay for light control lamp on) (12V), 16V for photovoltaic panel (with delay for light control lamp on) (24V)Light Controlled Light Off Threshold: 8V for photovoltaic panel (delay for light control switch off) (12V), 16V for photovoltaic panel (delay for light control switch off) (24V)USB Output: 2 way USB output, 5V 2.5A (maximum)Standby Current:<10mAWorking Temperature: - 35-+60 ℃Purpose: Solar controller