From old datasheet system VDD CONTROL dual TONE dual tone 128 notes, Switch of one octave lower output, TO92-3L?DIP 16L or CHIP form BOOK, EMC FILTERS, EPCOS, DaTa 20; RoHS Compliant: Na 128双音指出,一个八度低输出,TO92 - 3升开关?双酯16L型或芯片形式 dual tone 128 notes, Switch of one octave lower output, TO92-3LDIP 16L or CHIP form 128双音指出,一个八度低输出,TO92 - 3升开关?双酯16L型或芯片形式