Connect to your smartphone, or use it standalone. This memory-built-in Bluetooth(R) headphones bring your sports and music closer together. Sports-type Walkman that can also be used as Bluetooth(R) headphones, active in a wider range of situations. Tough specifications with seawater compatibility, dustproof, and cold/heat resistance. Enjoy it to the fullest in various sports scenes. Running in the rain or swimming in the pool. You can enjoy your favorite music even at the beach or on the sand. Equipped with a function that captures ambient sounds and human voices with built-in microphones in the left and right headphones. You can pay attention to your surroundings even during sports, and communicate with people around you. The external sound intake function can be switched ON/OFF, so you can use it when you want to concentrate and when you want to hear outside sounds. Currently, this product is not available at the Sony Store. - Brand: SONY - Color: Blue - Accessories: USB cable, ear tips, storage case - Model: Wireless Earphones I've only used it a few times. How about it? Thank you for viewing.