Charging current: 30 A; USB output: 5 V/3 A max; Battery voltage: 12 V/24 V auto. Precautions: The solar regulator is only suitable for lead-acid batteries, not for nickel-hydride, lithium, Liions or other batteries. 【LCD Display】 The solar charge controller comes with a large LCD display that can clearly indicate the status and data, * the display voltage. * Display battery current. * Dual USB charging interface. 【Safety Protection】 Multiple electrical protection: short circuit protection, open circuit protection, reverse protection, overload protection. 【Functionality】Equipped with an industrial-grade STM 8 microprocessor to control the charging and discharge process and it has reliable battery charge and discharge time management. 【Satisfaction Guarantee】 The solar charge controller is easy to install and use. Size: 135 x 70 x 32 mm. Weight: 150 g. Suitable for home, industry, trade, etc. 30 days hassle free money back, 12 months warranty and professional after-sales service within 24 hours.