【4 in 1,Free Your Hands】Sleep headpone&sleep headband&Bluetooth sleep masks&Bluetooth sports headwear 4-in-1.It makes your exercise more relaxed and comfortable.The SANNWEEN Bluetooth sleep headband has a built-in microphone that can be used to answer and make calls. It is not only suitable for use in sports activities, but also for side sleepers. 【Small size, multi-purpose 】 The SANNWEEN Sleep headpone has a small size, making it easy to carry around. At the same time, it can also be used as a hair band, headband, and wrist guard in your sports and leisure activities. Always revealing fashion and convenience. This Sleep headpone is made of skin friendly and comfortable fabric, and is a washable material. Wearing it will give you a comfortable feeling. 【HIFI Binaural Stereo Sound Effect】The Sleep headpone adopts the latest Bluetooth technology, which can provide more stable connection with mobile phones, tablets, laptops, or PCs. The ultra-thin speaker can produce high fidelity stereo sound quality and provide a soft and comfortable music environment. 【Powerful battery life, ultra long standby】 Built-in powerful battery and Bluetooth 5.0+EDR chip , this sleep headphones only needs to be charged for 1~2H,Continuous call/music playback for up to 13 hours, Continuous standby for 100 hours. Disassemble and Washable Bluetooth Sleep Headphones music headband is more convenient to keep and clean. 【Multiple colors,Integrated and versatile,Suitable for Multiple Roles】 SANNWEEN Sleep headpone earphones are suitable for various sizes of head shapes and have multiple colors to choose from. Whether you are playing tennis, play badminton, running, Gym and Other strenuous Sports, or yoga, walking, leisurely listening to music, It can keep your hair elegant and prevent your eyes from sweat interference. * Bluetooth version: 5.0+EDR * Bluetooth transmission distance: 10M * Music playing time: Maximum sound 7h, medium volume 10 hours * Bluetooth standby time: 72h * Battery capacity: 150mA/h * Battery power: 0.55w * Horn impedance: 32 ohm * Transmitting power: 6dB * Audio output distortion: 0.6% * Audio output SNR: 93dB * Charging time: 1-2 hours * Maximum input voltage: DC 5V * Maximum input current: 150mah * Maximum input power: 0.55w