Product information: Color: M1-BL10-Bluetooth light-Black M1-BL10-Bluetooth light-navy blue M1-BL10-Bluetooth light-medium gray M1-BL10-Bluetooth light-Army Green M1-BL10-Bluetooth light-pink M1-BL10-Bluetooth light-light gray blue M1-BL10-Bluetooth light-bright orange M1-BL10-Bluetooth light-peacock blue Transmission range: 10 meters Chip type: Zhongke Lanxun Battery life: more coal 8 hours Material: Plastic Usage: head up Size: Note: 1. Asian sizes are 1 to 2 sizes smaller than European and American people. Choose the larger size if your size between two sizes. Please allow 2-3cm differences due to manual measurement. 2. Please check the size chart carefully before you buy the item, if you don't know how to choose size, please contact our customer service. 3.As you know, the different computers display colors differently, the color of the actual item may vary slightly from the following images. Packing list: Knitted hat * 1 Product Image: