Material: light-emitting part: PP, handle: ABS resin Product size: Total length 25*3CM Power supply: using 3 x No.7 batteries (regular batteries not included) Product operation mode. There are 2 keys on the bottom of the product. Key A is a striped key, flip down to select the colour Key B is a smooth key, flip up to select a colour On: Press either A or B to turn on Off : Press and hold for 2 seconds to turn off either A or B Colour change : After turning on the light colours, press A to switch colours in order (press B to go back one colour), 15 colours in total. Press to, 2, 3.... . 15, 16 times, 1-15 for 15 colours, 16 for lamp colour auto-cycle mode, press 7 times for lamp to go out. (If you press B you start in the latter mode, e.g. 16 15, 14, 13.... . 3, 2, 1). Colour change sequence: (Red) (Green) (Blue) (Pink) (White) (Yellow) (Light blue) (Light green) (Purple) (Orange) (Light pink) (Aqua blue) (Light yellow ) (Dark green) (Light red) Fifteen colours change automatically.