Blue tooth sleep mask can be used for calling , music and microphone 🎤 👉 Business lunch break , traveling when tired, relax or a short nap. 👉 Use during yoga 🧘‍♀️ ✨️ practice. 👉Not afraid of light interference, sleep day or night. 👉 Sleeping with Travel , Business sleep supplement. 👉 Comes with its own charging cable. 💛💛 Easy to use , I bought for myself because I love to listen to frequencies and to darken my room except I am a very tiny woman and it's too big for me. 🙄🙄 Too much trouble with returns so I'm just selling it on here for close to what I paid.