Feature 1 Automatically identify system voltage of 12V/24V. 2 Wiring terminals has corresponding icon marks for connecting battery, solar panel and DC load. 3 Dual MOS anti-backflow circuit, low heat production. 4 Full 3-stage PWM charge management. 5 Built-in short circuit protection, open circuit protection, reverse connection protection, overcurrent protection. Features: 1. Automatically identify system voltage of 12V/24V. 2. Wiring terminals has corresponding icon marks for connecting battery, solar panel and DC load. 3. Dual MOS anti-backflow circuit, low heat production. 4. Full 3-stage PWM charge management. 5. Built-in short circuit protection, open circuit protection, reverse connection protection, overcurrent protection. Specification: Model: CM3024Z Max discharge current: 30A Batt voltage: 12V/24V auto Charging Type: PWM Material: PVC Color: Black Size: Approx. 190 x 90 x 50mm / 7.5 x 3.5 x 2.0in Weight: Approx. 373g / 13.1oz Package list: 1 x Solar Charge Controller 1 x Manual Note: 1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item. 2. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.