- Longer Working Time: We changing amorphous (thin-film) panels to poly crystalline solar panels, which increases the photoelectric conversion rate from 10% to 17%. Compared to other brands, it can store more electric energy under the same sunlight. - 300mAh Battery: Each solar light with 3 lumens, warm white led, 4 packs will add safety and soft glow to your deck, porch, or other outdoor structure，making nightly stroll safe for the family. - Automatic turn on: This step light has no switch, just pull out the insulator sheet then put it into use. On sunny days only takes about 4-5 hours to fully charge, can automatically turn on at whole night.