Fully wireless earbuds work without a cable. You can connect the earbuds wirelessly to your smartphone or tablet via Bluetooth. The 2 earbuds automatically connect to each other. A charging case is always included with fully wireless earbuds. In this charging case, you can charge the earplugs anytime, anywhere, so you never run out of music. The battery of fully wireless earbuds is shorter than that of wireless earbuds, so you have to charge them more often.