HEARING AID SMALL DISCREET SOUND HEARING AMPLIFIER BATTERY On-ear hearing enhancer High-performance hearing amplifier that can be easily operated by hanging behind the ear and is universal for both left and right ear, recommended for people with moderate hearing impairment; Volume control and charging capability The volume is adjustable with a rotating button; a built-in compact battery that can be charged via USB. Noise control The digital signal processor can intelligently reduce noise, making the sound more realistic and soft. Comfortable material The ear hook is made of TPE medical silicone, so your skin will never hurt after prolonged wear. One-piece design that makes the earplugs enter the ear canal and make wearing more smooth. Two modes Two listening modes can be switched freely. The L mode is suitable for a quiet environment, and the H mode is suitable for a noisy environment. Noise Canceling Digital chips for noise cancellation and voice amplification Comfortable and long-lasting wear The ear canal is made of soft silicone material to reduce discomfort, and it is also suitable for people who wear glasses. Long duration of action 40 hours of listening time after 1,5 hours of fast charging Loud and clear High and low modes, choose the right mode depending on the environment for the best hearing effect. Adjust the sound with the scroll wheel volume buttons. Easy control and ready to use Features a separate operation button and rotating ear cups for both ears Perfect gift for family Product parameter： 1. maximum sound intensity: 129 /- 3dB 2. sound amplification:> 40dB/- 5dB 3. total harmonic wave distortion: < 10% 4. Frequency range: 450-3400 MHz 5. input noise: < 32dB 6. Voltage: d.c.1.2V 7. current: < 1,2mA 8. Full charge about 23 hours 9. Working for more than 40 hours