Hallomall 9 LED Clip On Music Stand Lights-3AA Batteries Included- Adjustable Cordless Portable Led Lamp for Mixing Orchestra Work Craft Table (Powered by AA Batteries, AC Adapter or USB Cable) Multiple Power Sources, powered by free AC adapter or free come with 78" USB power cord or free 3AA Batteries, very convenient. Fully adjustable, and lightweight, - 1 Arm (Goose neck) and 9 Powerful LED Lights. Notes: Please kindly remove the thin wrapper around the batteries before installing. Durable LEDs last 100,000 hours - no replacement necessary.And durable construction, Sliding switch controls two brightness settings Large Area of Lighting: With a large area of illumination, spreads light evenly on the your music sheets.