TRANSMITTER:
1.Transmission frequency:86MHZ
2.Modulation mode: FM
3.Range available: about 35m(with no interference)
4.Power supply:2*AAA batteries or 4.5V adaptor,

Receiver(headphone)
1.Frequency range:84-108MHZ
2.Reception mode:FM
3.Distortion: less than 2%THD
4.Power supply:3V 2* AAA batteries
(Products color in sliver, purpule,red,black,green etc.)