Popular I7tws Wireless Binaural Bluetooth Headset in-Ear Earplugs I7 Invisible Wireless Mini Earphone. Wireless Headset, wireless Earbuds

Bluetooth version: 4.2

Battery capacity: 350mAh

Listening to music: 2.5 hours last and next song/pause

calling time: 3 hours

standby time: 240 hours

charging time: 1-2hours