9V battery; 4 switches, 3 tones
Sound Power: 100 dB

Features:

• Utilizes a push button, which offers a hygienic solution for multiple operators

• Provides a loud, clear and consistent sound every time

• Give verbal commands without a whistle in user's mouth

• Fox 40 Electronic Whistle® has three distinct tones that can be aimed in
  specific directions:
  Off / Tone 1 / Tone 2 / Tone 3