The Rechargeable Bulb Light features colored filament within a clear bulb. Powered by a USB-rechargeable battery (cord included) that delivers 6-18 hrs of light after about 90 minutes of charging time, the bulb can be held safely in your hands and has a flat bottom so it can stand on a table or desk. Toughened glass with an aluminum spiral base. 4 step dimmer for desired brightness. USB rechareable cable included. It’s also equipped with a realistic base that is nevertheless just a bit too large to be screwed into a standard outlet—thus preventing unsafe use.