Updated Umbrella Light - Super bright with max 400 lumens, matched USB charging cable, more convenient to charge via AC adapter (not included), power bank, computer or wall charger. 2 Brightness levels (28LED/8LED) - left switch for 8 LEDs (Dim, 120 lumens), right switch for 28 LEDs (Super Bright, 400 lumens). Meet your different brightness needs on different occasions. Easy to Install and Convenient - No extra tools needed, easy to attach to your umbrella with the built-in self-adjusting automatic clamp, applicable for pole size from 2.0cm to 5.2cm in diameter, suitable for mostumbrellas. 2 Built-in premium rechargeable batteries - the light will last 18 hours in super bright mode and 54 hours in dim mode after fully charged in 8 hours. Umbrella light with 28 bright LEDs, built-in rechargeable batteries, much more eco-friendly and efficient than other old versions. Wide Application: Suitable for camping, barbecue, playing cards or sitting in the yard at night with your family or friends, etc. Simple Installation: Cordless design with built-in flexible automatic adjustable clamp, no tools required, just attach to your umbrella. Note: The batteries are well protected and do not require any modification. Please do not unscrew the lid. The umbrella light is equipped with a compatible USB charging cable. The adapter is not included. Power source with a universal charging port for power adapter, computer, power bank, etc. Applicable to most parasols. Minimum clamp diameter: 2 cm ( 0.1 cm). Maximum clamp diameter: 5.2cm (0.1cm) Pack 1-28 LED Umbrella lamp (2 built-in rechargeable batteries) 1-USB charging cable 1-manual