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NKTECH HY-504 Car Audio High Power Digital Amplifier 4CH x 45W Hi-Fi FM Radio Player Support SD USB DVD MP3 Motorcycle Vehicle

14-28 Days
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Can play U disk SD/MMC card for music and FM stereo radio, support MP3 music format (USB+SD+FM).
Selected high-power four-channel professional power amplifier integrated circuits, minimal distortion, strong power.
Pre-professional level input operational amplifier IC for circuit design, sound, transparent, bright.
Filtering and anti-large-capacity power circuit.
DSP sound field pattern of the four, Tow main channel output.
It supports FM radio play (FM: 87.5 to 108MHz).
With USB/SD card playback function.
The power amplifier that meets the real four channels in the market, the power is strong, which is more than half the power of the same kind of amplifier.
With iPod, MP3, CD /DVD player input jack.
Remote control make your operation more convenient in a long distance.
Input voltage: DC 12V/5A.
Frequency response: 20Hz-20kHz.
Output power: RMS 45W x 4.
Harmonic distortion: < 0.05%.
SNR: 85db.
High control: 12db ±10KHz.
Bass control: 12db ±100Hz.
The signal level: 220MV 47K.
FM Frequency Rang: 87.5MHz to 108.0MHz.
Reader U-disk format: MP3/FM.
Channel: 4.
Impedance: 4 to 8 Ohm.
Material: Aluminum shell.
Note: Please read the instructions carefully before use.
Package included:
If you select Without Adapter:

1 x NKTECH HY-504 Digital Amplifier Player.
1 x English User’s Manual.
1 x Remote Control.
1 x Connect Wire.
If you select With 12V 5A Adapter:
1 x NKTECH HY-504 Digital Amplifier Player.
1 x English User’s Manual.
1 x 12A/5A Adapter.
1 x Remote Control.
1 x Connect Wire.
If you select 12V 5A Adapter only:
1 x 12V 5A Adapter (Fit HY-504/HY-604/Lepy LP-168S/LP-269S).


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, if you’d like a refund you can request one no matter the reason.

If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
If you received the wrong item you can request a refund or a reshipment.
If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of SmilysStores (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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