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Yytfy is committed to providing you with high-quality products and timely services to help you enjoy the happiness of shopping, and enjoy the outdoor life in the fun! How do charge the headphones? ➤ The package included a USB charging cable but no charger, Please Rest Assured, it's compatible and any USB charger should work. ➤ The charging port of the headphones is located on an extra cable next to the large button. ➤The large USB port next to the button can be used as a power store, charging your phone or other devices when they're low on power. Specifications: Bluetooth Version: V5.0+EDR & CSR Chip Bluetooth Distance: 20M MIC Distance≤1M Lithium Battery: 3.7V/3000mA Charging Time: 2-3 hours Standby Time:1000 hours Working Time:180 hours Bluetooth Matching Name: A8 What do you get? 1 x Helmet Headphone 1 x USB Cable 8 x Velcro 1 x User Manual The correct installation position of the speakers will bring a better sound quality experience, we make a few suggestions: √ Please make sure the speakers are pointed at the ears and shorten the distance between them while making sure the speakers are not covered or folded. Because the installation position and the distance of the ear have different effects on the sound quality and volume. √ The way to increase the volume is to install the speakers as close to the ear as possible(But don’t be too close to make your ears uncomfortable). You also can adjust the volume on your phone to achieve what you want. √ After installation, if there's a gap around the speakers, we recommend that you can stuff some cotton into the gap to prevent the wind from blowing in. Tips: If there have any questions during the use of our product please feel free to contact us through Amazon Messenger, We‘re ready to help!