1、Adjustable volume, 8 levels for selection, you can turn up the volume from low to high, providing you the best sound quality. 2、Easy to operate, powered by 1 * AAA battery (Not Included), enjoy your life with this lovely stuff. 3、Comes with silicone ear plugs, not easy to slip off, it will be very comfortable to wear for a long time. 4、Made of user friendly material, flexible, safe to wear without harming ear canal. 5、It includes 2 pieces of earplugs in different sizes, a cord and a main unit. 6、Portable size, it has a clip at the back, nice for you to carry it outside. Specifications: Model: X-136 Material: Silicone Gel; ABS Color: Grey Sound Output: 130±5dB Sound Gain: ≥50dB Frequency Range: 300~4000Hz Input Noise: ≤30dB Battery: 1 * AAA Battery (Not Included) Voltage: DC 1.5V Working Current: ≤ 4mA Item Size: Approx. 7 * 4 * 1.8cm / 2.76 * 1.57 * 0.71in Package Size: Approx. 11.6 * 8.1 * 3.1cm / 4.57 * 3.19 * 1.22in Package Weight: Approx. 88g / 3.1oz 1 * Sound Amplifier 2 * Earplugs 1 * Cord 1 * English User Manual