Note：Because of the problem of distance induction：
125Khz can be directly worn on the hand to directly respond.
13.56Mhz needs to take off the ring.The ring of the ring is facing the product.Carry on the induction
User cab set snart ring as the way to unlock the screen of mobile phone, no matter the mobile phone already has other unlocking ways, such as gesture code or password. (this function is only available in the mobile phones whose android ROM is not highly customized.)