Programmable Single-/Dual-/Triple- Tone Gong | Summary of Features: Supply voltage range 2.8 V to 18 V; Few external components (no electrolytic capacitor); 1 tone, 2 tones, 3 tones programmable; Loudness control; Typical standby current 1 mA; Constant current output stage; Highefficiency power stage; Shortcircuit protection; Thermal shutdown