Long Battery Life- M20 Bluetooth earpiece built-in 220mAh rechargeable polymer lithium battery, provides 8-10 hours music play/call on a single charge. And the earphone is fast charged fully in 1.5 hours. Easy Operation- Long press the power button for 3s to turn on/off, once click to play/pause/answer/hang up, long press for 2s to reject call, double click to redail the last call; Click once the "+"/"-" to switch previous/next song, long press the "+"/"-" to adjust volume. Left/Right Ear Wearing- The Bluetooth earbud can be 180 rotated, fit for both left and right ear wearing, the earhook design and TPE soft material make no pain to the ears, suitable for long-time wearing, such as sleeping, walking and working etc. IPX5 waterproof/sweatproof withstands sweaty exercise in the gym. Universal Compatibility- The Bluetooth headphone is compatible with most Bluetooth enabled devices, including cell phones, tablets, and laptops. It can also connect to 2 devices at the same time. About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.