Battery capacity: 400 mAh polymer lithium battery, with 25CM USB Type-C cable. Mini size, can organized in small size for taking, very convenient for outdoor, travel or business trip use. On/off key: the on/off key lightly to adjust the light color. and hold the on/off key for stepless dimming. Battery or USB rechargeable mini LED reading lamp, can stand on desk or clip on book. Oval shape light head, can bring wide light range, the light brightness is soft and comfortable for reading. 3 kinds of light color and stepless light brightness, can be adjusted by switch, can meet different using requirements. Stand on and clip on way for use, the clip on way is suitable for both book or table clamping, very practical. For USB rechargeable power way, the lamp can light on 3-4 hours after full charge, according to different light brightness and color. Colour:White Material:ABS+PVC+electronic components Size:4.6 x 8cm Package Contents: 1 x Mini Foldable Book Light 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.