1. Easy maintenance. 2. Lightweight and high efficiency. 3. Easy to install. 4. Wide range of applications including outdoor, mountain, grassland, power generation, charging, and portable emergency charging. Solar Panel: Name: 30W Solar Panel Tolerance: +/-5% SLA Battery Voltage: 12V Type of Solar Cell: Monocrystalline Open Circuit Voltage (Voc): 12V Maximum System Voltage: 12V Temperature Coefficient of Isc: (0.10 +/- 0.01) %/°C Temperature Coefficient of Voc: - (0.38 +/- 0.01) %/°C Temperature Coefficient of Power: -0.47%/°C Temperature Range: -40°C to +80°C 40A Controller: Rated Voltage: 12V/24V Rated Current: 40A Max PV Voltage: 50V Max PV Input Power: 650W (12V), 1300W (24V) Color: Black Material: Monocrystalline silicon Size: 420 x 270 x 15mm Package Contents: 1 x Solar Panel with Battery Clip 1 x 40A Controller Note: Light reflection and different displays may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by +/- 1-3cm.