Specification: Blue/Red LED indicator. Transmission distance: 10 meters. Bluetooth version: 5.0 + EDR. Frequency response: 20Hz - 20kHz. USB: micro USB. Power: 200mAh lithium rechargeable battery. Play time: 5-7 hours. Headband material: polyester. Suitable for both men and women. Color: Black. Package includes: 1 x headband, USB charging cable, user manual. Great multi-function sleep headphones: Combines sleep headphones, sleep mask, and sports headband in one. This 3-in-1 Bluetooth headband allows you to listen to music without additional headphones, helping to keep hair and sweat under control. Built-in microphone enables hands-free calling. Ideal for gym, workout, running, yoga, and other outdoor activities. The eye cover is comfortable enough to support restful sleep in any position. Extended usage time and high-quality o performance: Upgraded USB rechargeable battery provides 5-7 hours of continuous playtime. High-quality chipsets deliver clear sound and reliable o performance even during active use. The Bluetooth headband supports wireless connectivity, allowing use without holding your phone. Soft and breathable design: Made from soft, lightweight, and durable materials with breathable mesh lining. The headband stretches easily to fit various head sizes and is hypoallergenic. The band is washable—simply remove the speakers before cleaning. Includes light-blocking eye mask for improved comfort during sleep.