1. 12V/24V Auto adapt, small size, easy to operate. 2. High efficiency intelligent PWM 3-stage charging. 3. PV array short circuit, over charging, battery reverse polarity, output short circuit. 4. Built-in two 5V 2.1A USB interfaces. 5. Built-in IR self-learning infrared remote control to turn the DC loads on and off. 6. Reverse protection, short circuit protection. 7. Designed for 12V/24V solar power system. 8. Hanging style design makes it convenient to install. 9. Available in 20A/30A/40A/50A/60A.