Middle switch on body、 easy to turn on/off ; There have 2 switches、 long press power switch can turn on/off; half press can realize page up and page down fuction ; The tube can be remove then use as a flashlight at any time、 very convenient ; RGB with 12 kinds of single color + 3 kinds of gradient color circle. Dimensions: 9.84 in x 1.57 in x 1.57 in (25.0 cm x 4.0 cm x 4.0 cm) Weight: 3.16 oz (90 g)