Bluetooth LED Light Knitted for Running Hiking Black This bluetooth is made of polyester materials, with excellent elasticity, which can provide maximum comfort for most multi-functional indoor and active outdoor activities. There are 3 levels for you to choose the most suitable brightness: weak light, strong light, and red and blue light. 300 mAh rechargeable lithium battery. The unique Bluetooth equipment can establish a stable connection with the mobile phone, can support music and calls, built-in stereo speakers and microphone, convenient and practical. 200mAh rechargeable lithium battery. This hat with LED light offers you a port for battery charging. You can charge it in car charger, computer, socket or power bank. Great hat for runners and outdoor adventurers in winter. Wear it running, camping, hiking, Hunting, Jogging etc. in dark night and enrich your quality of life! Specification: Material: Acrylic Fibers Size: 22x21.5x2 cm/8.66x8.46x0.79 inch Bluetooth: V5.0 Package Includes: 1 Piece