Item Type: Solar Controller Product Size: Approx. 16.5 x 10.5 x 4.5cm / 6.5 x 4.13 x 1.77in System Voltage: 12V 24V automatic adaptation. Maximum Photovoltaic Voltage: 23V maximum at 12V battery, 46V maximum at 24V battery. USB Output: 4 way USB output, 5V 2.5A maximum. Standby Current: <10mA Working Temperature: -35 - +60 Function: Solar Controller Weight: 313 g / 11.04 oz(approx.) Material: ABS Package List 1 x Solar Controller 1 x User Manual 1Smart Charging: Using industrial control chip, the solar controller supports complete three phase charging management. 2Better Display: The large LCD screen can clearly display the charging and discharging current, temperature and so on. 3High in Safety: Built in auto reset overcurrent protection, short circuit protection, open circuit protection and more. 4Other Function: Enables light and relay control, parameter adjustment, power off memory, etc., the operation is easy. 5The USB Output: The maximum current of dual USB output can get up to 2.5A, which can be used for phone charging.