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 2.5A, 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. Item Type: Solar Charge Controller Material: ABS Gross Weight: 202g / 7.1oz Product size: 12.5x10x3cm / 4.9x3.9x1.2in Model: K1688 System Voltage: 12V 24V automatic adaptation Maximum Photovoltaic Voltage: 23V at 12V battery; 46V maximum at 24V battery Lifting 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:<10mA Working Temperature: - 35-+60 ℃ Purpose: Solar controller 1 x Solar Controller 1 x Instruction Manual