Gikfun 16 Music Box 16 Sound Box Electronic Production DIY Kits 16-tone Box for Arduino EK1724 Suite name: 16 Music Box (DIY Kit) Operating voltage :4.5-5V PCB size: 48mm (length) * 41mm (W) Control modes: manual coding + external coding 16-tone box under your control, arbitrarily issued 16 kinds of interesting analog sound, both an electronic toy can also be used as a doorbell or alarm