Acoustic Revive RR-77 Ultra Low-Frequency Pulse Generator create 7.83Hz waveform into your listening room to help shield undesired noise that coming through your system via EMI and RFI forms from your audio gears. The result is an unbelievable improvement in better soundstage, clearer presentation, tighter bass and much more. Input voltage is 100V-240V (inclusive in the box is an AC adaptor). The unit is new in box and never been used or opened. We provide 1 year factory limited warranty to every single one of our product sell here. The price is inclusive with an Internationl Express Mail Service (EMS) to your door. We prefer payment via PayPal as it is the most secure method for both buyer and sellers. The item will be shipped 1 day after we receive confirmation of payment from Paypal. If you have any questions, please feel free to contact me by email.