LED Electricity-free Lamp 6pcs high brightness led. Color: silver, green size: 310*80mm weight: 60g packing:color box The lampcan give out high brightness just by feeding off telephone line.It is totally power free whatever you use it for study or just keep it light night long.This product is absolute safe and reliable because it feeds off common telephone line for high-brightness LED bulbs, the product is indeed of cold light source and utterly safe for children.