Specification: 1) PLL technology  2) multi-directional transmission  3) frequency: 863.1MHz-863.5MHz or 912.5MHz-914.5MHz. 4) frequency range: 20Hz ~ 20KHz  5) distortion: <=0.5%  6) S/N Ration: > 60 dB  7) frequency range: 20Hz ~ 20KHz 8) R/L channel separation: >30dB  9) transmission range: 100 meters  10) power supply (transmitter): DC12V 11) power supply (headphone): 700mA/H rechargeable NI-MH battery

Feature: 1. ultra-high frequency, high fidelity  2. ultra-low distortion 3. transimission through walls, floors, ceiling etc. with ease  4. strong stereo sound  5. strong anti-disrupption capability  6. high power output   7. low FCC   8. stable performance    9. designed for EU&US markets    10. Simple & elegant look widely applicable to PC, TV, DVD VCD, MP3, MP4 and other major audio sources.