Green Music/Everyday In-ear Headphones Wireless Microphone type: Built-in Built-in battery Lithium-Ion (Li-Ion) Introducing LinkBuds Fit: Weighing just 4.8g, these earbuds provide ultimate comfort, with an innovative new air cushion to ensure a secure fitwhatever youre doing. As theyre water resistant, sweat nor rain can hold you back.The sound quality is exceptional, with detailed highs, powerful lows, and a rich mid-range. Theyre Hi-Res Audio Wireless certified, with DSEE Extreme to upscale every track, and you can tailor the sound to your preferences using the EQ inside the Sony app. Ultimately, LinkBuds Fit deliver an immersive music experiencejust the boost you may need to power your next workout or commute!High-quality noise cancelling lets you block out the world and fully focus on your music. The first Sony earbuds to feature the Auto-NC Optimiser, LinkBuds Fit even detect changes in your environment to maximise the effect.Alternatively, stay connected to your surround