SUNDING SD-603 Waterproof Loud Cycling Electric Bicycle HornSUNDING SD-603 Waterproof Loud Cycling Electric Bicycle HornSUNDING SD-603 Waterproof Loud Cycling Electric Bicycle HornSUNDING SD-603 Waterproof Loud Cycling Electric Bicycle HornSUNDING SD-603 Waterproof Loud Cycling Electric Bicycle HornSUNDING SD-603 Waterproof Loud Cycling Electric Bicycle Horn

SUNDING SD-603 Waterproof Loud Cycling Electric Bicycle Horn

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10-25 days. Ships within 4 days.

543 in stock.
  • Free Worldwide Shipping
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Product Description

Waterproof Loud Cycling Horns MTB Bike Bicycle Handlebar Ring Bell Alarm Speaker Cycling Parts Accessories1. One Key Control, Easily install and compatible with all bikes including road bikes
2. Security Surveillance: If the Bicycle is shaking, the horn will sound an alarm for 15 seconds
3. Password Change Function
4. Waterproof, Ultra-loud & clear sound
5. Easy and safe to use when braking


Model: SD-603
Material: Plastic
Color: Black
Size: 6cm(Length)*4.2cm( Diameter); Length of cable: 18cm
Battery: LR44*4 (Included)


-Loud Alarm
-One key Control
-Password controlled
-Vibration Alarm
-Password Change


1. Security Surveillance
Press the “0” button for 2 seconds, the alarm will sound a “tick” after the first second, and double “tick” after the second seconds, then release the button. After 3 seconds, a long sound of “tick” will appear, Which means Surveillance begins.

If the bicycle is shaking during the period, the horn will sound an alarm for 15 seconds, when the alarm stops it still in the Surveillance State. If the bicycle shakes again, a further 15 seconds alarm will follow.

2. Password Change
Press the “3” button for 3 seconds, the alarm will sound a “tick”, then input the old password( default setup is 0000), after two short sound of “tick”, input the new password. ( note: a password is a four-figure number)

3. Password lost
Remove the battery for 10 seconds and reinstall it, the password will be back to the default one of 0000


1×Bicycle Horn
4×button cell
1× English Manual

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Item Specifics

Brand Name: 
Model Number: 
 Electric Horn
 6*4.2 cm
 LR444 (Included)
 6cm(Length)*4.2cm( Diameter); Length of cable: 18cm
 LR44*4 (Included)


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.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-20 Business days
Canada, Europe 10-20 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

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 Tactical Magpie (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.