Hi-Fi immersive sound.Big battery low endurance.Active noise-canceling. Dual channel active noise reduction technology can eliminate noise from the external environment and ear canal.Dual-mic call noise reduction.Low latency. The signal is stronger and more stable.Bluetooth 5.1 version.Wide compatibility with android and iOS.13mm big dynamic speaker. AAC/SBC clear treble with balanced three-frequency adjustment. The speakers offer a wider sound field and restore original sound quality.Fast connection auto pairing. Smart auto pairing. You open the case and power on. 1 second fast connection giving a more intelligent experience of function switching.Sensitive touch control. The built-in capacitive sensing smart components do not require the frequent operation of the mobile phone.Half in-ear design makes it comfortable and stable to wear. The front and rear sound-cavity are designed with an angle of 108 degrees which lead to balanced air pressure inside and outside the ear.Stand by time 140 days.Talk time 4 hours.Charging voltage DC5VTransmission distance 10-15 metres.Frequency response 20-20000Hz.Earbud charging time 1.5 hours.Charging case battery 320mAh.Music play time 6-8 hours.