Super Mini Size:Machine size is 0.65 * 0.54 inches, which can be well hidden in your ears. Wire drawing can help you take out the machine. Tip: Please locate the earplug to fit the ear canal, otherwise it will cause noise.We will come with three different size earplugs Comfortability: You may feel uncomfortable when you first use it. Please don't stop using it, because you will feel comfortable slowly in the next time. It has the advantages of miniature, long battery life, durability, waterproof and sweat proof. So you will like it. Gift bundled: In addition, we will give you a box for you to carry, three earplugs for you to change the most appropriate size. An adjusting rod can adjust the volume. Instructions: Before using, first turn to the lowest volume, from the beginning to high-pitch, use the adjusting stick to adjust until you feel comfortable. If not used, please adjust the volume to 1, Or remove the batteryso as not to cause battery loss.