[Fit] The setting that fits the size of the ear can be adjusted. You can enjoy music and call at full hands-free driving, meeting, cooking or sports. The size of the earphone body is ultra small, smaller than 100 yen coin, and when worn on the ear, it can not be seen completely from the back. Super lightweight type with 5.3 g (one ear)! Feeling of wearing enough to forget what you are wearing, even if you are wearing it for a long time will not get tired. <br> • [Storage Case with Charging Function] The storage case that can be repeatedly charged to the earphone can also prevent the loss of earphone. Ideal for cases such as business trips and traveling. Simple and easy to operate one-button tone headset design, multi-function is focused on one button. (It is possible to realize all the operations such as music play / pause, call start / end / refusal with one button.) <br> • [High-quality Bluetooth earphone] Bluetooth V4.2 CSR64110 is adopted, hands-free calling is possible without taking out a cellular phone with built-in microphone. Compatible with devices with Bluetooth function, it can transmit voice signals up to about 10 m, you can enjoy clear high-quality sound without worrying about the code. Listening with calm sound quality is hard to get tired. CVC 6.0 noise cancellation function is adopted, noise around the call is blocked, and more clear speech sound quality is realized. Four types of profiles such as A2DP, AVRCP, HFP, and HSP can be supported. Because it is ergonomically designed, it fits ear, it hardly falls even during exercise such as running, moreover, you can select ear, S, M, L 3 sets of earpieces to achieve comfortable and stable wearing. <br> • [Lightweight Waterproof] You can use it comfortably for a long time with various scenes such as training, drive, walking, desk work, working, commuting, school attendance, DVD viewing, telephone conference etc. It corresponds to splash proof which can be used safely even in rainy weather and sweat. Adopted materials that are water repellent for open ports. This prevents water from entering the inside and can be used without concern for rain or sweat. • Package Contents: X3TBluetooth earphone + Rechargeable storage case body, Earpiece × 3 pair (S, M, L) * M initial installation, USB charging cable, storage bag, Japanese instruction manual If you send an e-mail to a dealer, you can respond to reissue).