KERUI 300ft 120dB Wireless Door/Window Sensor Alarm Anti-Theft Door Alarms Remote Control for Home Safety Security PIR Smoke
ID: 42246

KERUI 300ft 120dB Wireless Door/Window Sensor Alarm Anti-Theft Door Alarms Remote Control for Home Safety Security PIR Smoke

4.8 (39 votes) | 113 orders
Price: US $27.26 - 212.76 / piece
Discount Price:
US $ 11.17 - 82.64 / piece

Door Sensor Alarm, Remote Control 300ft 120dB Wireless Door Contact Sensor Anti-Theft Door Alarms for Kids


When the magnetic sensor is disconnected, the KERUI door and window alarm system will issue a loud 120dB warning to prevent theft and unnecessary access, preventing your child from sneaking out.


This wireless door alarm kit comes with a wireless remote control for arming, disarming, SOS and doorbell options. It makes it easier to remotely control door/window alarms up to 300 feet


You can select the doorbell mode to draw attention when people enter, as a commercial doorbell when entering. With the SOS option, seniors can easily get help in an emergency. Good protection.


You expand your home security alarm system with more alerts or remote controls,Infrared detector, door sensor, smoke detector, gas detector, emergency button.

Click the link below to buy accessories


This anti-theft door and window alarm is easy to set up. Simply install it with the double-sided tape provided. Take just a few minutes


When the battery is very low, the alarm volume will decrease and the alarm time will be shortened, reminding you to replace the battery [Not included]

Technical Parameter

Model: KR-D121 Working voltage: 3.0V (powered by 2 AAA batteries) Standby current:

  • Brand Name: KERUI
  • KERUI Model: D121
  • Origin: CN(Origin)
  • Kit Configuration: Door Sensor
  • Power: 2 AAA batteries
  • Output Number: 1
  • Video Interface: No
  • Display: No
  • Alarm Type: The Alarm
  • Size: 100*35*15mm
  • Model Number: D121
  • Password Keyboard: No
  • Arming Type: FR Remote-controller
  • Connection Type: Wireless
  • Zone Number: 20 remote control +40 detector
  • Type: Alarm system
  • Model: Anti-Theft Door Alarms for Kids
  • Working Voltage: 3V
  • D121 Power Supply: 2 AAA batteries
  • Alarm volume: 120db
  • Wireles Range: 300ft
  • Feature1: Door sensor burglar alarm
  • Feature2: Work with Alarm Accessories
  • Suitable: Home/Store/Factory


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 location 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 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 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.

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.

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 receive 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 Useck - Security & Protection (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.



Thank you for your interest doing business with us!

If you would like to get a discounted price for your large purchase orders, fill in the required blanks along with your email address, the product Item ID # and/or the link of the item that you want to order, item quantity (minimum of 30 pieces), shipping country and payment method is required. We will contact you with a discounted price as soon as we receive your inquiry.

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