1.knock musical cup 2.flashing and pub Knock activated Musical glass1.Add a touch of glass to your next party.2.Made of clear PS or Acrylic plastic with 7 LED multi-color lights that shifts through 3 modes at the touch of a button; fast blink, slow blink, and steady-on.3. LED lights colors you can choice as you like, red,blue,jade,multi-color,white… are availabe.4.Replaceable AG13*3pcs batteries ...