1. Easy maintenance. 2. Light weight and high efficiency 3. Easy to install and easy to install. 4. Wide range of applications (outdoor, mountain, grassland and other power generation, charging, 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 Ystem Voltage: 12V Temperate Coefficient of : (010+/- 0.01 ) %/C Temperate Coefficient of Voc: - (0.38 +/-0.01 ) %/C Temperate Coefficient of Power Voc: -0.47%/C Temperature Range: -40 Celsius to +80 Celsius 40A Controller: Rated Voltage: 12V/24V Rated Current: 40A Max.PV Voltage: 50V Max.PV Input Power: 650W(12v) 1300W( 240v) colour:Black Material:Monocrystalline silicon size:420 x 270 x 15mm Package Contents: 1 x Solar Panel with Battery Clip 1 x 40A Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.