... vibration sensor, shadow sensor or rocking switch.Main component: speaker, PCB, IC, batteries, switch, wiresSpeaker available: 40mm, 29mm, ... , outside cartonCarton size: 56*28*39CMInstruction for use (greeting card for example)Step 1: take out the transparent ... gifts, electronics component. For example sound chip, sound box, music greeting cards, plush toys, sound books, LED lights. Speaker pull ...