Inbuilt with smart light control, auto charge during the day and automatic lighting at night;Withstand water-resistant, rust-proof, dust-proof and moisture-proof. Easy to install, no electricity bill, no wiring. 8Hrs illuminates and never feel pitch darkness when you step stairs at front door or garden. Ideal for decorating outdoor stairs, fences, decks, walkways and more. *SENSITIVE LIGHT SENSOR - Without switch, just pull out the insulator tab to use. It turns on automatically at dusk and turn