Bluetooth V5.0 True Wireless Technology.Featuring the latest AUTO ON/OFF technology. When you take out the earbuds from charging case, they will be turned on automatically, and when you put them back in the case, they will be turned off and get charged without touching any button.Want to enjoy true wireless stereo effect? Use in pair. Want it be mono for calls? Use one only.Stereo Call – You can now hear the voice from both earbuds when making phone calls.Intuitive MF Button – The MFB on the right earbud now can be used to adjust the volume in reverse cycle. And the one on the left earbud is for tracking to next song.Sweatproof IPX4: Applying the nano-coating technology to protect the earbuds against water & sweat during running and workouts.Voice prompt in English, ChineseUp to 10 meters (33 feet) in working distance (open space)Bluetooth profile: handsfree, A2DP/AVRCPIn-ear ergonomic design with a variety of silicon eartips in different shapes and sizes for 100% secure fit.Multipoint connection: This feature works only when you use one earbud individually.Up to 4 hours music playback time (varies by volume level and audio content)Up to 4 hours talk timeUp to 100 hours standby timeCharging Case with built-in 500mAh battery capacity for storage and charge, provides 3 additional charges for 2 earbuds - total additional 12 hrs.Dimension of each earbud: 28.3 X 15.4 X 14.4 mmWeight of two earbuds: 8.4gDimension of Charging Case: 87.6 X 54.6 X 43.8 mmWeight of Charging Case: 55gAccessories Included In The Box:6 x In-ear eartips (Shortened-shape)6 x In-ear eartips (Bowl-shape)6 x In-ear eartips with locking ridge1 x Charging Case1 x USB Cable