description ��oemitter-emission frequency :87.5 MHZ-modulation mode :FM-emission distance : 30m(with no interference)-power supply :2 ?�� AAA batteries(not included) or 4.5V DC receiver(headphone)-frequency range :87.5MHZ for wireless headphone and 88-108MHZ for FM radio-reception mode :FM-distortion :?�� 2%-power supply : 2 ?�� AAA batteries(not included) package included:-1 pcs emitter-1 pcs receiver (headphone)-1 pcs instruction manual-1 pcs audio cable