The Sony WF-C510 are made to fit nice and snug, so they stay comfy all day. In fact, they're some of the lightest and smallest earbuds Sony have ever made. They sound fantastic too. DSEE technology upscales music to bring it closer to how it originally sounded. Plus, you can tweak the EQ or pick from a bunch of sound presets to find your perfect vibe. If you're heading out for a jog or ordering a coffee, simply switch on Ambient Sound Mode to connect to the world around you.Good to know- Hop from one device to another with Bluetooth multipoint - handy for incoming calls- Between the buds and the case, you get up to 22 hours of battery life so you can keep the tunes coming- If you're about the head out the door, a quick 5-minute charge will give you 1 hour of playback- Launch Spotify and jump straight into your music with Spotify Tap - no need to touch your phone- They can handle a bit of rain thanks to the IPX4 water resistant design