【Lightweight Design】 The C1 model features a lightweight design of only 25g, ensuring comfort even during extended use. 【Bone Conduction Technology】 Enjoy music without blocking your ears, allowing you to hear ambient sounds for safe use. 【Long Playback Time】 Offers up to 10 hours of playback, providing peace of mind during outings and workouts. - Model Name: C1 - Bluetooth Version: Version 3.0 - Weight: 25g - Playback Time: 10 hours - Waterproof Function: Yes - Operating Distance: Approximately 10m I am selling this because it didn't fit me well after trying it on. Everything in the photos is included. Thank you for looking.