?20-Hour Long Battery Life?With the built-in 240mAh rechargeable lithium battery, it takes only 2 hours to fully charge by the micro USB charging cable. And it can last to work for about 20 hours, brings you all-day music enjoyment. ?Keeping Working While Charging?This upgraded Bluetooth receiver can keep working while it is charging, which means it will never stop streaming. It will pair with the last pairing devices automatically when you turn on the Bluetooth function of the device. ?Easy to Use?Pairs with your Bluetooth devices like smartphone/tablet/laptop and connect it to your car stereo/old speaker/home stereo system/wired speaker/headphones by the 3.5mm/RCA audio cable (included). NOTE: There isn’t a built-in microphone, CANNOT support hands-free calling. ?Save Your Old Speakers?Golvery J205 Bluetooth receiver is a perfect solution to make your old speaker/stereo system/car stereo/wired headphones to play music wireless from your phone/tablet/laptop via Bluetooth connection. Bring new life to your old audio equipment! NOTE: it is NOT a Bluetooth transmitter, CANNOT work for TV/PC to pair with Bluetooth headphones/speaker. ?The Latest Bluetooth V5.3? With upgraded Bluetooth V5.3 technology and the advanced chipset, combining A2DP profile, this J205 receiver comes with stable connectivity and remarkable signal stability. Provides high quality and clear Hi-Fi music streaming. Creates enjoyable listening experience.