Have you tried to contact after-sales service? You can send it back for repair or replacement.

emmm，I think all B2 users have the same problem. Because of the position of the antenna, when you block B2 and mobile phone with your body, sometimes the signal will be cut off

If you can speak Chinese, you can join the official Chinese QQ group of yinlvmei. You can see the real devices of S3 and W1 in it, and some people who have already bought will answer your questions for you 61822981

Yes, B2 is different from other devices of the same type. It has no corresponding app to use. It has the function of USB DAC, which can be connected to the computer. At the same time, there is a microphone at the bottom, which can provide the call function after connecting to the mobile phone...

The device doesn't support Eq. the volume is adjusted by a knob. It uses an analog potentiometer, I own yinlvmei B2， The device doesn't support Eq. the volume is adjusted by a knob. It uses an analog potentiometer,