• SP1711: meet ANSI S3.19. NRR value: 33dB.
• SP1712: CE EN352-1 approval. SNR value: 27dB.

• Serves as a standard earmuff when not activated to reduce noise level.
• Multi-Purpose: reduced noise level, protecting hearing sense,
  amplifying tone, and keeping off external loud noise.
• Receiving voice at frequency 400~4000 Hz, making voice clearer
• All noise levels encountered that exceed 80dB are attenuated to ensure
  safe use in noisy environment for longer hours.
• Ideal where impulse or high noise levels are encountered but speech communication
  is important.
• The 1.5V x 2 AA batteries are easily replaced by opening compartment on the ear cup.

• SP1711: meet ANSI S3.19. NRR value: 33dB.
• SP1712: CE EN352-1 approval. SNR value: 27dB.

• Serves as a standard earmuff when not activated to reduce noise level.
• Multi-Purpose: reduced noise level, protecting hearing sense,
  amplifying tone, and keeping off external loud noise.
• Receiving voice at frequency 400~4000 Hz, making voice clearer
• All noise levels encountered that exceed 80dB are attenuated to ensure
  safe use in noisy environment for longer hours.
• Ideal where impulse or high noise levels are encountered but speech communication
  is important.
• The 1.5V x 2 AA batteries are easily replaced by opening compartment on the ear cup.