Ring Alarm Contact Sensor (2nd Gen) (2 Pack) White 4SD2SZ-0EN0

Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White

Model: 4SD2SZ-0EN0

SKU: 6403968

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Questions & Answers

97% would recommend to a friend

Customers are sayingCustomers praise the product for its exceptional ease of use, overall performance, and straightforward installation. They also appreciate its security features, compact size, compatibility, good price, long battery life, and thoughtful design. However, some users have reported minor issues with connectivity and limited range. A few customers also noted concerns regarding sensitivity and occasional unexplained motion detection.

This summary was generated by AI based on customer reviews.

Ease of use (562)
Overall Performance (153)
Installation (137)
Security (61)
Size (60)

Connectivity (10)
Range (9)
Sensitivity (6)
Motion Detection (3)

Customer Images

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

Rated 5 out of 5 stars
Extra sensors to protect all of the windows
Had to buy more ( 6 ) sensors to protect the windows. The ( 4 ) sensors that came with the Ring Alarm system were used to protect the doors. Easy to install , compact and they will work when offset from each other or turned sideways. Had to be creative for two of the doors..... kitchen door to garage and the sliding glass door. ( see enclosed pics ) So far everything has been working great and no false alarms.
This review is from Ring - Alarm Contact Sensor (2nd Gen) (6-Pack) - White
Posted 6 years ago by Roberto
Rated 5 out of 5 stars
Works great!
We started with the security system and added these door sensors to our system at home. They were simple to install and add to our Ring App security system. We have every door protected and they have worked great since day 1. If you are looking for a great way to protect your home and install it yourself I highly recommend these comtact sensors.
This review is from Ring - Alarm Contact Sensor (2nd Gen) (6-Pack) - White
Posted 5 years ago by Dadlife
Rated 5 out of 5 stars
HOME SECURITY
THESE CONTACT SENSORS LET ME SLEEP GOOD AT NIGHT- THEY ARE LIKE HAVING A SECURITY GUARD WHEREVER U PLACE THEM - EASY TO INSTALL & QUALITY MANUFACTURING WHAT ARE U WAITING FOR.
Posted 4 years ago by TONY
Rated 5 out of 5 stars
Great door sensor for my back door
Works great! I have several door sensors. They all work great!
This review is from Ring - Alarm Contact Sensor (2nd Gen) (1-Pack) - White
Posted 6 months ago by JosephT
Rated 5 out of 5 stars
Ring is the way to go!
I am a huge Ring fan! I have invested a lot of money in to my Ring system and I have my home set up like Fort Knox. I love my new addition.
Posted 1 year ago by MsNik

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Customer Images

Extra sensors to protect all of the windows

Works great!

HOME SECURITY

Great door sensor for my back door

Ring is the way to go!