
FREE shipping to
Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar.
Q: Is the battery replaceable in this detector?
A: Yes, the battery is replaceable in this detector.
Q: Does this device require other products to operate?
A: Yes, this device requires Ring Alarm or Ring Alarm Pro to operate.
Q: What kind of battery does the motion detector use?
A: The motion detector uses AA batteries.
Q: How many motion detectors are included in the package?
A: There are two motion detectors included in the package.
Q: Can this motion detector work with Alexa?
A: Yes, this motion detector works with Amazon Alexa.
Q: Does this motion detector require a subscription?
A: Yes, this motion detector requires a subscription for in-app features and digital notifications.
Q: What is the maximum wireless range of this device?
A: The maximum wireless range is 250 feet.
Q: Can I buy these individually and use them without buying any other ring products?
A: You would need a ring base station. You would then be able to control the sensor with the ring app on your phone.
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.

Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar.

Act fast against burglaries with this SimpliSafe glass break sensor. It triggers an alarm if it detects the sound of shattering glass within its 20-foot range, providing reliable security even when no motion detector is used. This SimpliSafe glass break sensor utilizes detection algorithm and digital signal processing technologies for accurate sound recognition.

Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar.

Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap.
| Pros for Ring - Alarm Contact Sensor (2nd Gen) (1-Pack) - White | |||
|---|---|---|---|
| There were no pros for this product— | Ease of use, Installation, Security, Sound Detection, Design | Ease of use, Installation, Compatibility, Performance, Size | Ease of use, Installation, Compatibility, Price, Battery Life |
| Cons for Ring - Alarm Contact Sensor (2nd Gen) (1-Pack) - White | |||
| There were no cons for this product— | Sensitivity | Connection, Range, False Alarms, Motion Detection, Stickiness | There were no cons for this product— |