Ring Alarm Contact Sensor 2-Pack 2nd Gen, Instant Window & Door Alerts, Slim Design, 3-Year Battery Life, Base Station Required

• Amazon now offers Ring Door and Window Alarm Sensors 2-Pack with approximately 3-year battery life, requires Base Station, now $19.99 (list price $39.99).
• AI Review Summary: ⭐Amazon rating: 4.7 / 5 (29,433+ Reviews). Users generally report that these sensors are reliable with Ring integration, compact, easy to install, and provide peace of mind when paired with a security system.
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: Get an instant alert on your phone the moment a door or window opens, so you can stay informed about activity at home even when you're out. The sensors are noticeably smaller than the previous generation, making them discreet on door or window frames. Installation requires no tools—just peel off the adhesive backing and press into place. The two batteries last around three years, so you won't have to worry about replacing them anytime soon.