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Features: 1. Full digital circuitry for natural, clear sound and great listening comfort2. Low power consumption for long time use3. Feedback cancellation, automatically reduce the whistling that bothers many people4. Digital volume control by rocker button5. With receiver in the ear allows clear and loud sound6. Left/right ear adjustability, adjust the tube to left or right so that you can wear it in your ears Product Specifications: 1. Model: RL-7012. Color: Beige3. Net Weight: 0.17oz / 5g4. Material: Plastic5. Working Voltage: DC 1.5V 6. Working Current: ≤1.5mA7. Frequency Response: 500-3200Hz8. Max Saturation Acoustic Output: 129+3dB9. Full-on Acoustic Gain: 36±5dB10. Total Harmonic Distortion: