for Home works on a 5V/10W solar panel that has a backup of 6-8 hours with battery 32Wh 10000mAH 3.2V LiFePo4. It gets charged during the day time and lights up automatically in the night. With 4-6 hours of charging in the direct sun, for Garden gives you a backup upto 12hrs (Auto mode) Hardoll for Outdoor does not need electricity and works automatically. It works on solar energy and hence using these in your garden all night long would not cost you extra. It actually saves energy, thus by reducing your electricity bill.