The Sonic headphones create your audio experiences via your skull bone, leaving the ear canals open. This allows you to stay on top of the traffic situations as you're not isolated from your surroundings. Pair the headphones with your phone's Suunto app so you can choose the sound mode and other features. You can also use these headphones to take care of phone calls if you want to. - Sweatproof, rainproof (IP55) - Battery run time up to 10 hours - Charging in as little as one hour, with a 3 hour use result with just 10 minutes - Sound control with bass boost, increased sensitivity and less noise leaks - Titanium body and silicone surface - What's in the box: headphones, charging cable, storage bag, quick instructions For the technologically oriented, the following data may be interesting. For everyone else, the following is stuff you probably don't have to worry about. - Bluetooth 5.2, range > 10 m - Supported audio formats: A2DP, AVRCP, HFP, HSP - Supported sound coded: SBC, APTX