About this item 【Premium Material】Portable Bluetooth speaker provides strong outstanding material, durable case, and port cover make the speaker have better internal protection. The Bluetooth speaker dazzles the ears with clear highs, stunningly crisp mids, and a rich, expansive bass profile that delivers impressive audio quality without distortion, even at maximum volume. 【Key Function】When play music, (USB card/TF card/Wireless/line-in), short press for "play/pause". In FM mode, press short to search station automatically. And press again to stop searching. Under wireless mode with mobile paired when call coming, press short to answer a call hands-free, press again to hand up, press twice to ring up a call. 【Slot Function】DC 5V slot: Use the standard Micro USB V8 charging cable for power charging; TF slot/USB slot: It can decode and play MP3 format audio when put TF/USB card into the slot; AUX line in the slot: Use the Mini 3.5 head input through outside devices; provides 8 hours of working time. https://sellercentral.amazon.com/abis/listing/edit?marketplaceID=ATVPDKIKX0DER&ref=xx_myiedit_cont_myifba&sku=K9-KNJM-KICP&asin=B0BKS1DN3T&productType=SPEAKERS#product_details:~:text=ofworkingtime.-,PortableConvenientDesignConvenientportablespeakerwithabuiltinsecurity,technologyupto10m/32.8feetofconnectionrangewithoutdistortion.,-100SatisfactoryService 【100% Satisfactory Service】Combine with the high-quality chip, you will be surprised by the powerful loud stereo sound coming from such a compact and portable speaker. Wireless portable Bluetooth speakers should be a must-have in your life. If you have any questions or suggestions about the use and sound quality, we will be happy to discuss them with you and reply within 24 hrs.