This USB night light, reading light, is small  portable, it need to plug into a USB port, like mobile charger, mobil phone charging head, or a car usb port. Scenes to be usd:Car atmosphere light, Outdoor camping, Indoor lighting, Reading at night, Emergency lighting. Rated power: 1W Voltage: 5V Product weight: 0.21 Ounce Product color temperature: white: 6500K, Warm White: 3000K Product size: 0.98 long*0.98(with USB connector, total length 1.45)