MASTER SLAVE SWITCHING & BLUETOOTH 5.0: Freely master-slave switching, Most advanced Bluetooth 5.0 technology. Supports HSP, HFP, A2DP, AVRCP. Otium T21 Bluetooth Earbuds brings you super tws, super fast connect, super easy pairing, super stable.

UP TO 30 HOURS BATTERY LIFE: The wireless earbuds can last for 3-4 hours of playtime on a single charge. The fully charged charging case can continue to power the headset for 7-8 times, bringing you a total 30 hours of wonderful music world. With a weight of only 3.9g, causing zero pressure to the ear.

SNUG FIT & DEEP BASS: Designed to a seamless fit in your ears and offer 4 different sizes earbuds for choices, allow you to stream music with CD-like audio quality with powerful bass and crispy mid-highs through a unique speaker driver.

ONE STEP PAIRING & SMART TOUCH CONTROL: Automatic system brings you a hassle-free experience.You just need to open the lid of charging case and they'll automatically connect to the last paired device. The intelligent touch control button is multifunctional, such as play/pause music, answer/hang up a call, the next/previous song, activate Siri. Smart life, choose T21 wireless earbuds.

IPX7 WATERPROOF & SWEATPROOF: With innovative SweatShield Technology, you can use the earphones freely for sweating it out at the gym or singing in the rain. If you are Not Satisfied with your purchase for any reason, please Feel Free to contact us at the buyer center or support email, 24/7 Quick Reply.