Specially Designed For Sports Activities. Thanks To Their Flexible And Non-Slip Attachment Hooks, They Stay Comfortably In Place Throughout Your Workout. Sport Buds 2 Are Also Sweatproof (Ipx5).Features:- Designed For Sport: Perfect Holding Thanks To Its Flexible Hooks. They Stay Comfortably In Place Throughout Your Workout.- Sweat Proof: They Can Resist The Sweating Of Any Sports Session. They Are Ipx5 Protected.- Earphones + Case: 16 Hours Of Music: The Earphones 4 Hours Of Autonomy. With Its Charging Case You Can Get Up To 12 More Hours.- Control Music And Calls: Thanks To Its Multi-Function Touch Surface, You Can Control The Playlist, As Well As Receive Calls.Technical Specifications:- Bluetooth Version: 5.1 + Edr- Speaker Impedance: 16 O ± 15%- Sensitivity: 99db ± 2- Frequency: 20 Hz - 20,000 Hz- Bluetooth Profiles: A2dp V1.3 / Avrcp V1.5 / Hfp V1.7 / Hsp V1.2- Operating Distance: 10 Meters- Headphone Capacity: 50 Mah Each Headphone- Charging Case Capacity: 700 Mah- Charging Interface: Type C- Play Time: 4 Hours.- Charging Case Charges: 4 Times- Input: 5v 700mah- Output: 5v 120mah- Earphones Charging Time: 1.5 Hours- Case Charging Time: 1.5-2 Hours.