WattEDGE Super Bright 4 LED Rechargeable Solar Desk Lamp, USB Book Light, Laptop Reading Light, Flexible Gooseneck Design, IP55 Waterproof Great for Outdoors or Camping SAVE MONEY AND GO GREEN! Power this lamp by solar energy OR a USB cable. Stop wasting electricity and help SAVE the environment! LOW COST AND EFFICIENT! Operates up to 3-4 HOURS after a full charge or CONTINUOUS power in sunlight or by USB. Built in ON/OFF switch to conserve the energy of the LED light until you need it most! BUILT WITH 4 SUPER BRIGHT LED LIGHTS! More efficient then their incandescent/halogen counterparts and emits a cool white glow. STOP WORRYING ABOUT BATTERIES! This LED desk lamp is completely RECHARGEABLE through the sun's energy or it's USB port. VERSATILE AND SLEEK! Gooseneck design allows for FLEXIBLE adjustments to point the light just where you need it!