• SP1721: meet ANSI S3.19.        NRR value: 30dB.
• SP1722: CE EN352-1 approval. SNR value: 25dB.

• Efficient hearing protection and high quality FM radio reception.
• Separate volume and tuning controls.
• Lightweight and portable combined with excellent noise reduction.
• Very comfortable and user friendly.   
• Natural sound impression by stereo to upgrade sound quality for FM radio effects
• Independent FM and volume adjust knobs (88 MHz ~108 MHz)
• Ideal for production line personnel who work outdoors.
• Cell life in inverse proportion to length of use and amplification results in noisy environment.
• The 1.5V x 2 AA batteries are easily replaced by opening the compartment on the ear cup.
• Service life of alkaline cell ranging about 70~72 hours.
• Easy cell replacement simply by opening up the cell cabinet.

• SP1721: meet ANSI S3.19.        NRR value: 30dB.
• SP1722: CE EN352-1 approval. SNR value: 25dB.

• Efficient hearing protection and high quality FM radio reception.
• Separate volume and tuning controls.
• Lightweight and portable combined with excellent noise reduction.
• Very comfortable and user friendly.   
• Natural sound impression by stereo to upgrade sound quality for FM radio effects
• Independent FM and volume adjust knobs (88 MHz ~108 MHz)
• Ideal for production line personnel who work outdoors.
• Cell life in inverse proportion to length of use and amplification results in noisy environment.
• The 1.5V x 2 AA batteries are easily replaced by opening the compartment on the ear cup.
• Service life of alkaline cell ranging about 70~72 hours.
• Easy cell replacement simply by opening up the cell cabinet.