An adapter with a USB (Universal Serial Bus)-C connector for a 3.5 mm earphone jack, means that you can connect the earphones to a smartphone that does not have an AUX input. The adapter is made from high quality materials, resistant to breakage & minor mechanical damage. The gold-plated tips prevent any rustling or interference. Enjoy your favourite music wherever you are. Convenience of Use The headphones connect to the device of your choice as soon as you remove them from the case via Bluetooth 5.3. What's more, they pair independently with your equipment, so you can use 1 headphone or 2 as you're comfortable. Up to 25 h of Playback Each of the headphones is equipped with a 40 m Ah battery, which translates to about 5 h of playback. The case's battery capacity, on the other h&, is 300 m Ah, so you can use them for a total of about 25 h. In turn, they remain in standby mode for up to 250 h. After about 1.5 h of charging, they will be ready to use again. Compatible Baseus Bowie WM01 are compatible with all