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- On/off switch
- Volume Dial
-Mini Microphone
- Battery Cartridge (1 x AG13 cell, included)
- Two sized earbuds for personalized fit
- Max sound output: 129 +/- 5dB
- Sound gain >= 45dB
- Distortion <= 5%
- Frequency range: 300~4000Hz
- Noise <= 23dB
- Current <= 5mA (voltage 1.5V)
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