1.PLL function
2.Frequency:863.1MHz~863.5MHz
3.Frequenz:20Hz ~ 20KHz
4.Distortion: <0.5%
5.S/N Ration: > 60 db
6.Separation: < 30 db
7.Effective transmitting range : up to 300 feet
8.Headphones battery: 700mA/H rechargeable battery
9.AC Adapter with UL-listed