Search  for anything...
HENDUN

Upgraded Bike Alarm Waterproof with Remote, Electric Bicycle Door Burglar Alarm,eBike Anti Theft 113dB Loud, Adjustable Sensitivity, Scooter Accessories Vibration Sensors

    • Based on 1,714 reviews
Condition: New
Checking for product changes
$17.99 Why this price?
Save $7.99 was $25.98

Buy Now, Pay Later

As low as $4 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, May 2
Order within 21 hours and 19 minutes
Available payment plans shown during checkout

Features

  • SUPER LOUD 113DB - Vibration triggering loud alarm to scare away thieves.Prevent Robbery and Door Prying.
  • ADJUSTABLE SENSITIVITY - High sensitive vibration sensor,7 level from gentle touch to push or beat.Adjustable volume.
  • EASY INSTALLATION FIRM AND WATERPROOF - No wiring, no screw,provide super strong adhesive tapes and cable tie for installation.IP55 waterproof design, can use for outdoor.
  • MINI SIZE - 3.7"*1.6"*0.8" exquisite and compact design, easy to hide and install, suitable for bike/car/motorcycle/door/moped anti-theft alarm.

Brand: HENDUN


Maximum Range: 20 Meters, 10 Meters


Noise Level: 113 dB


Remote Control Included?: Yes


Manufacturer: Changzhou Hengdun Electronic Technology Co Ltd


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 3.7 x 1.8 x 0.6 inches; 4.48 ounces


Item model number ‏ : ‎ KS-SF22R


Batteries ‏ : ‎ 3 AAA batteries required.


Date First Available ‏ : ‎ November 19, 2018


Manufacturer ‏ : ‎ Changzhou Hengdun Electronic Technology Co Ltd


Country of Origin ‏ : ‎ China


Customer Reviews: 4.4 4.4 out of 5 stars 1,714 ratings


Item Weight: ‎4.5 ounces


Product Dimensions: ‎3.7 x 1.8 x 0.6 inches


Country of Origin: ‎China


Item model number: ‎KS-SF22R


Batteries: ‎3 AAA batteries required.


Is Discontinued By Manufacturer: ‎No


Wireless Remote: ‎Yes


Date First Available: November 19, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Good features, perfect performance. Dig deeper for programming options
Works great. Don't forget to fully explore the finer programming like type of alarm, loudness, and shake sensitivity. This has done everything we needed. Use it on a mobility scooter that we have to sometimes leave out of sight.
Reviewed in the United States on April 13, 2025 by KA
    • Sound the alarm!
First off, I am a real unpaid Amazon customer. This alarm is amazing. Just loud enough the scare off the bravest of Thieves. The motion sensor is sensitive butt it gives a warning before the full alarm goes off. So if it's windy, the pre alarm might sound and if it keeps getting jostled around the full alarm will come on. Otherwise, just the warning will sound if no more motion is detected. The key fob is simple and does exactly what it should do. Actually doesn't feel cheaply made nor is it the best I've ever used. Time will tell. For now I'll say that this is a very functional and easy to operate alarm and well well worth the money. ... show more
Reviewed in the United States on January 14, 2020 by MM
    • LOUD
Tried to change volume setting and it seems every option is just loud A F! 4 star because the settings don’t seem to do anything as advertised.. Definitely works and I don’t hesitate to leave my ebike alone while shopping anymore. Easy to install/hide in multiple applications could even use as a car alarm for much cheaper than a hard wired set up with zero wiring to deal with. Highly recommend, the remote is nice to have just wish it came with 2 ... show more
Reviewed in the United States on September 1, 2023 by Amazon Customer
    • Great Price
Wow this is an AWSUM unit works better than I hoped it would SUPER LOUD and sensitive.
Reviewed in the United States on March 20, 2025 by ki0ad
    • Awesome little device
received and installed without issue works well thus far no complaints. It is indeed quite loud for a small device was surprised and I love it thus far.
Reviewed in the United States on January 8, 2025 by Landael Willins
    • Great little deterrent and loud as can be!
Fantastic addition to my E-bike. It definitely helps me keep piece of mind when chaining it up somewhere or even while it’s stored in my screened in porch. It is super sensitive. Just a couple of times I’ve tried opening my pannier bags without turning it off and it went off! It’s small enough to not be noticeable and is a great investment to give me extra security to protect my bike. ... show more
Reviewed in the United States on April 22, 2025 by Brian W Barker
    • Needs more Oomph
It operates as advertised but volume not enough to do the job.
Reviewed in the United States on March 24, 2025 by Pete W.
    • Small and packs a punch!
Review Image by Tim Bogisch Tim Bogisch
Review Image by Tim Bogisch Tim Bogisch
This product is pretty small and convenient to use with the remote. We are using it as a catalytic converter theft deterrent. The provided alarm with the car is not sensitive enough to go off if something is cut out from the bottom of the vehicle (ask me how we know). So we attached this to the back of the frame and the muffler/exhaust system on our vehicle. Due to the proximity to the very hot exhaust system, we swapped out the provided plastic zip ties for 16 gauge galvanized steel wire and covered the back and sides with pipe insulation foam and a couple of layers of thick tin foil. (Foam, high temp glue, and wire from the local big-box store). It hangs from the bottom so that it moves freely and it doesn't look the prettiest, but you can't see it unless you crawl all the way under the car. The speaker is aimed at the ground for maximum sound reflection. Sensitivity The highest sensitivity setting works great. If you so much as tap/touch the exhaust system it sets the whole thing off. (the exhaust system is connected to the frame with its own suspension system so touching it anywhere shakes the whole thing). There is first a loud warning chirp and if you touch it again within a short amount of time it will go off for roughly 30 seconds. (if you continue to cause it to move, it will continue to go off). So if it is accidentally set off it will stop on its own without you using the remote to turn it off, which was a huge plus for me. For being so small it's quite loud. From reading the other reviews we did decide to swap the provided batteries out with higher quality ones. We will not be using the provided SOS signal because it is not used on a back, but we didn't have to worry because it comes programmed without that being turned on. ... show more
Reviewed in the United States on October 8, 2022 by Tim Bogisch Tim Bogisch

Can't find a product?

Find it on Amazon first, then paste the link below.