Open-ear technology allows you to listen to music and at the same time still hear your surroundings. Instead of traditional in-ear headphones, Suunto Sonic sits on your jawbone leaving your ear canal open to stay aware of the nature or traffic around you. Suunto Sonic does not only feature a lightweight, comfortable design but also a newly designed sound transducer. This allows for higher sensitivity, enhanced bass effect and a reduction in noise leakage. From blazing hot to freezing cold, from getting covered in sweat to running in the rain - Suunto Sonic has an IP55 rating, so that you can enjoy your sport in all types of conditions and still listen to your favourite songs. Suunto Sonic comes with up to 10 hours of battery life with one charge and is fully charged in 60 minutes. If you happen to run out of power just before a workout, a quick 10-minute recharge keeps your audio going for another 3 hours. Connect Suunto Sonic via Bluetooth to Suunto app on your phone to get the most out of your headphones. Change your preferred sound mode or switch the dual device connection off. With Suunto app changing settings is just a tap on the screen away.