Spec
-Blue tooth IC: CSR8635
-Speaker Type: Bone conduction technology speaker, 1w dual speaker
-Battery: 350mAh Polymer battery
-Mic Anti: interference microphones,‐50DB
-Play time: 7h
-Standby time: 15days
-Effective range: 15m
-Mono/Stereo: Stereo
-Blue tooth: Version 4.0
-Weight: 133g
-Bluetooth Class(1/II): II
-Bluetooth Profile: a2dp/HFP,HSP,AVRCP,GAVDP,AVDTP
-Receiving: Sensitivity 88dBm
-Impedance: 32Ω
-Frequency range 20‐20KHz
-Fully charged: 2h

Features:

*Compatible devices with Bluetooth, such as mobile phone.
*Perfect sound quality and effect, when you go out to enjoy unfettered music anywhere.
*Stereo Bluetooth transmission, strong output power with outstanding sound quality.
*Mask type, ultra-fine filter, free breathing, highly resistant to PM2.5/bacteria/dust/suspended particles.
*Rechargeable, suitable for both indoor and outdoor exercise.
*Bone Conduction,free your ears, less harm to eardrum, more safety, comfortable and health. Earbud design, care your ears.
*support play,volume control,previous song,next song,answer/end calls functions.