TWS 4 Wireless Bluetooth Earbuds Ear Buds Auto Connect on and Off with Charging case

Bluetooth version: V4.0+EDR
Transmission distance: 10 meters
Battery capacity: 350MAH
Talk time: 20 hours
Music time: 15 hours
Standby time: 200 hours
Charging time: 1-2 hours
Speaker：16Ω10mW x 2
Sensitivity: DBM -80
Signal to noise ratio: 95dB
Bearing: all directions
Frequency range: 2.402GHz-2.480GHz
Transmit power: 0dBm. Second (4dBm Max)
Working voltage: 3.7V
Working current: 18mA
Amazing Battery Life
Standby time up to 200 hours, music time up to 15 hours and talking time 20 hours, and you can see the battery indicator on your phone notification bar (it works for both Android and Apple). No need to worry about the battery life, just enjoy your trip and sports!
Crystal clear sound
Whether it's the calls or the music, the sound of this Bluetooth Headphones comes in very clearly and loudly. The Noise Cancelling quality for calling sounds natural and works great.
Smart Neckband Design
Having the freedom to move around and free your hands for other things, without the hassle of wires dangling around your body, and don't need to worry that the earbuds will drop off.