1、Its clearly sound quality and big power can be used for a long time. 2、Easy to wear design, conform to your ear shape, stable wearing and can ensures the comfort. 3、Full digital circuitry, low power consumption, adaptive noise reduction, adaptive feedback cancellation. 4、Soft silicone material, does not harm to your ear, and also ensure wearing stability and lasting. 5、Directly inserted into the recharging base for convenient USB recharging, and the indicator light can direct display the recharging status. 6、Easily button control, easy to power on/off and adjust the volumes, user friendly and convenient. 7、Three modes adjustable, you can choose normal mode, noise reduction mode, meeting mode according to your demands. 8、Comes with 6pcs earplugs in different sizes, widely suitable for different users with different demands. Specifications: Name: Sound Amplifier Material: ABS+silicone Battery: Earphone: 2 * 1.2V, 35mAh battery (included) Recharging base: 1 * 1.2V, 300mAh battery (included) Maximum OSPL90: ≤ 129±3dB Harmonic wave distortion: ≤10% Frequency response: 450-5000MHz Sound gain: ≥38dB±5dB Input noise: ≤29dB±3dB Item size: 40 * 17 * 9mm / 1.57 * 0.67 * 0.35in Package size: 145 * 95 * 50mm / 5.71 * 3.74 * 1.97in Package weight: 215g / 7.58ounce 2 * Sound Amplifier 6 * Replacement Earplug 1 * Brush 1 * USB Cable 1 * Recharging Base 1 * Plug 1 * Guideline