Product Description Material: Acrylic Size: tile size, 23 * 20 cm (the hat is elastic) Transmission range: 10 meters Lamp beads: 5 pcs Lumens: 125 lumens LED battery capacity: 300mah Bluetooth battery capacity: 200mah Power source: battery Light source form: LED Light color: white light, three levels of different brightness Color: black, dark gray, navy blue Quantity: 1 piece Package content: 1 piece * LED knitted hat 1. BEST MUSIC GIFTS: With the Bluetooth hat, you can enjoy music while protecting you from the cold. It allows cell phones to stream the talking phone directly to your audio devices without bulky headphones or earbuds irritating your ears. 2. BLUETOOTH 5.0: The best Bluetooth chip with 5.0 technology offers the most stable and strongest connection yet, is quick and easy to sync, while other people's connectivity may be disrupted. 3. SPECIAL LED DESIGN: Built-in and detachable special rechargeable LED light. There are three lighting modes (high level, medium level, blink level). It offers a standard USB port for charging the battery. You can charge it in the car charger, computer or portable power bank. More convenient to load. 4. REMOVABLE AND WASHABLE: Just pull up the brim for the LED knitted hat and push the light inside to disconnect the light and wash the cap or charge the light, no extra cables. There is a hole on the edge of the bluetooth device that makes it easy to remove and install the headphones when you want to wash the LED music hat. 5. WIDE APPLICATION: Due to its simple operation and use, the detachable to convenient washing of hats, especially for people who like to exercise in winter, can protect you from the cold. Particularly suitable for outdoor sports such as hiking, jogging, running, climbing, skiing, skating, hiking, camping or other outdoor activities.