Things to pay attention to before buying! ! ! Please read carefully！！！ This is a product authorized by JBL to Chinese distributors. The authenticity of the serial number can only be inquired on the Chinese website. If you need to inquire, you can contact customer service and let the customer service find it for you. inquiry mode: 1. Download the WeChat APP 2. Search the "Harman China" public account and follow 3. Click to enter and find the authenticity query in "Smart Share Service" 4. Enter the serial number This is the best product produced in China. The serial number can only be found on the Chinese website. Customers who purchase please pay attention to the product before purchasing. The product quality is guaranteed. If you are not satisfied, we all support returns and refunds. Contact customers at once, thank you for your support ★JBL Pro Sound delivers surprisingly big audio and punchy bass from Go 3’s ultra-compact size. ★JBL Go 3’s ultra-portable design goes great with the latest styles, and its design make it look as great as it sounds. ★JBL Go 3 is IP67 waterproof and dustproof, so you can bring your speaker anywhere. ★Wirelessly stream music from your phone, tablet, or any other Bluetooth-enabled device. ★JBL Go 3 gives you up to 5 hours of playtime on a single charge. ★Included Components : JBL Go 3, Type C USB Cable, Quick Start Guide, Safety Sheet ★Output Wattage : 4.2 Watts ★Power Source Type : Battery Powered ★Product Dimensions:3.4 x 1.6 x 2.7 inches