Operating instructions: 1. The first step is to gently pull out the transparent insulating sheet on the right side of the card; 2. In the second step, press the black button switch on the left; the card music lights will light up at the same time for 30 seconds. The advantages of our birthday cards: 1- A lifelike Warming LED light music birthday card to surprise and have fun with your birthday party! 2- Funny card, envelope. Fully equipped, no need to purchase extra other accessories. 3- The card has a lot of blank spaces for you to express your birthday wishes and greetings. 4- The blessing card made by laser cutting technology has fine workmanship and high quality. 5- A birthday card made of high-hardness,environmentally friendly paper is not dangerous to the body.You can safely give it to your family and friends.Let them feel your blessings. Product Information: Technique: 3D design/Handmade Material: Environmentally friendly high hardness paper Size:5.9*5.9 inch(folding size) Packing include: Warming LED Light Birthday Cake Music Card x 1 Envelopes x 1 Join the shopping cart and give your family or friends a sincere birthday greeting!