Features: brand new and high quality Active Noise Cancellation: Isolate the sound and listen to it, using a dedicated noise reduction chip, through receiving and analyzing the additional noise, the opposite signal is generated in the earphone to cancel it. Shocking Sound Quality Experience: Feel the shocking sound quality experience, can analyze the audio excellently, and present the original sound. Small Enough: Wear it for a day without getting tired, light per ear, in-ear design, no weight-bearing feeling. Super Battery Life: for Play for time 10 hours, standby for time 108 hours, battery capacity 100 mAh. Easy to use: The clip-on/hanging neck type can be retracted with one button, without wrapping, and it can be used after wearing and stretching. Specifications: Material: ABS Color: Blue, Black Net Weight: 96g/0.21lbs Package Includes: 1PC Wireless Retractable Lavalier Headphones note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.