... fetivals,holiays gift,promotion and advertisement > Time duration of sound file: 6s,10s, 20s,or more,could be customized ... 2,As soon as the paper card is opened,the sound will be played automatically> Battery: 2pcs x AG10> ... (folded),or could be made according to request> Sound file,artwork,size and shape of paper card could ... for different occasions> OEM and ODM is accepted Sound recordable greeting card