* Built in 1 LED flash circuit for sound output indication 4 siren sounds to be playing from 4 independent trigger keys (TG1, TG2, TG3, TG4 pin). * LH pin: Trigger mode option by one shot with re-trigger type (LH pin open) or level hold type (LH pin connect to GND).
* Built adjustable oscillator in IC body. * Built in power on reset and A/D & D/A circuit. * Built in 45K bits SRAM for delay control. * Adjustable delay time setting between 30 ms ~ 700 ms for Echo mode or Surround mode. * Lower operation current. * Application: VCD players, Karaoks, TVs