sell wireless earphone

Spec:  1) Emitter  
Emission frequency: 85.5?0.5MHz or 84.5?.5MHz;
Modulation mode:   FM;  
Emission distance:   ≥ 8m;
Power supply:      2 x AAA battery or 4.5V DC
Reception from any audio and visual equipment with audio out socket, such as TV set, audio device, DVD/VCD player, Multimedia PC, etc.
2) Receiver
Frequency range:    83-103MHz ?1MHz
Reception Mode:    FM
Distortion:          ≥ 2 %
Power supply:       2 x AAA battery
Packing:                 1PC/color box; 20pcs/carton 4.72?