Specifications:1) Voltage: 1.2V - 3.6V2) Typical operating voltage: 3V or 1.5V 3) Low power consumption4) Melody emitted when opening the card and the LED will flicker5) Proposed operating temperature range: -10 ~ +60°C 6) Cards features: 14.5*21cm (folded size), 4 colors printing on both sides,230g artpaper7) Music: lover me tender ,love story, wedding march(melody), for Alice, let me callyou honey, you're my sunshine etc.Packing: 1pc/OPP bag, envelope 450pcs/ctnCarton size: 0.098cbmG.W.: 20kg/ctnN.W.: 19kg/ctn producing area:China payment:T/T, L/C