Black Friday is hereShop new Doorbusters Shop now

Skip to content

Assistive Survey

$(csi.user.businessName)

Yardbird Best Buy Outlet Best Buy Business

Black Friday Deals
Deal of the Day
Discover
My Best Buy Memberships
Credit Cards
Gift Cards

Order Status

Main Content

Deals
Support & Services
Brands
Shop by Department

Deals
Support & Services
Brands
Discover
Shop by Department
Account
Order Status
Recently Viewed
Saved Items
Top Deals
Deal of the Day
Gift Cards
My Best Buy Memberships
Credit Cards

Skip To Results

/

/

Home Security & Monitoring

/

Door & Window Security

/

Door & Window Alarms

Door & Window Alarms

(2)

Sort by:

Best Selling

ecobee - SmartSensor 2-Pack - White
Rating 4.7 out of 5 stars with 744 reviews
$125.01
Compare
Compare
Knight Security - Premium Hidden Devices Detector - Hidden Camera RF Detectors & Bug Detector | Hidden Camera Finder, GPS Tracker - Gray
Not yet reviewed
$129.99
Save $20.01
Comp. Value: $150.00
Get it by Mon, Dec 1 • FREE
Compare
Compare

Get it fast

Pickup · Ready today

Shipping · Get it today55423

Price

to

Brand

Knight Security

Features

Current Deals

Discount

All Discounted Items

Customer Rating

Top-Rated

4 & Up

Brand Compatibility

Sponsored

Sponsored

Sponsored

Similar products from outside of Best Buy

sponsored

Sponsored

Visit our Support Center
Check your Order Status
Shipping, Delivery & Store Pickup
Returns & Exchanges
Price Match Guarantee

Order & Purchases

Check Order Status
Shipping, Delivery & Pickup
Returns & Exchanges
Price Match Guarantee
Product Recalls
Trade-In Program
Gift Cards

Payment Options

My Best Buy® Credit Card
Pay Your Bill at Citibank
Lease to Own
Buy Now, Pay Later

Support & Services

Visit our Support Center
Shop with an Expert
Schedule a Service
Manage an Appointment
Protection & Support Plans
Haul Away & Recycling
Contact Us

Rewards & Membership

My Best Buy Memberships
View Points & Certificates
Member Offers

Partnerships

Sell on Best Buy Marketplace
Advertise with Us
Affiliates: Creators & Publishers
Best Buy Health
Best Buy Education
Best Buy Business
Partner+

About Best Buy

Corporate Information
Careers
Corporate Responsibility
Sustainability

Sign in or Create Account

Get the latest deals and more.

Email Address

Best Buy appLearn more ›

How was your experience?

Best Buy Canada

Accessibility Terms & Conditions Privacy Interest-Based Ads State Privacy Rights Health Data Privacy Do Not Sell/Share My Personal Information Limit Use of My Sensitive Personal Information Targeted Advertising Opt Out CA Supply Chain Transparency Act

In-store pricing may vary. Prices and offers are subject to change. © 2025 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.