... power conversion rate, more than 90%* Powerful anti-jamming, it can work well even under the electromagnetism, electromagnetism ware and ... Record your voice to the chime, when Human body close, door chime, it will play.* Record door chime, human body sensor chime* ... Record your voice to the chime,when Human body close ,door chime, it will play.Record door chime,human body sensor chime Applicationsbell ...