This is a high copy of Redmi Airdots 2.
Detail: Connectivity: Wireless
Frequency response: 20-20000Hz
Impedance: 16ohms
Music Time: 3h
Sensitivity: 93dB ± 3dB
Talk time: 3h
Bluetooth: Yes
Bluetooth chip: CSR8610
Bluetooth distance: W/O obstacles 10m
Bluetooth mode: Headset
Bluetooth protocol: A2DP,AVRCP,HFP,HSP
Bluetooth Version: V4.1