The light arms adopt quality metal alloy material with high flexibility and hardness, can be set in any position and adjusted to the required angle and shape, providing a full range, multi angle choices for lighting. Multiple Power Supply Modes: the book lights for reading at night in bed have multiple power supply modes, including AAA battery operated or USB cable; In the power supply state, can be directly inserted into DC plug to replace the power supply, and the battery power will be automatically cut off without removing the battery; When being removed from the plug, the battery is powered on, simply press the button again; The package doesn't include battery(three sections). Meet Your Multiple Needs: the LED lights attached to the battery operated clip on lights are as bright as 3 common LED lights; The switches on the dual arms can be done with a light on, a light on both arms, two lights on the single arm, and all lights on the double arms, have no flicker, shadow or glare with the design for reading, meeting your multiple needs Adjustable Clips: the rechargeable night lights with adjustable clips can grip objects of different thickness; There is a small part equipped on the clip tail that can be turned independently, which increases the scope of clamping objects and makes clips firmly clamping on items Wide Purposes: the rechargeable book lights are very suitable for music stand, book reading, piano performance, orchestra, music performance, work table, computer, also appliable in knitting, sewing and craft situations, practical and versatile, you can carry them around for travelling or reading at night in bed. Colour: Black Material: ABS+Metal Package Contents: 4 x musical score lamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.