We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small white rectangular sensor with magnetic contact piece for door or window frame

Ring

Ring Alarm Window Door Contact Sensor White

SKU CH-2DXC-82YKQ

A contact sensor that alerts your phone when a door or window opens, running on two included CR2032 batteries for up to three years

  • SpecificationsSUPPORTED DEVICES Setup Requirement: Requires Ring Alarm or
  • FeaturesPOWER AND CONNECTIVITY Power: 2 CR2032 Coin cell batteries B
  • Get instant mobile alerts when doors or windows open
  • Triggers the Alarm system if a sensor is tampered with
  • Easy DIY installation with no tools required
  • Compact design enables more placement options
  • Powered by two CR2032 coin cell batteries included

Single Contact Sensor for Ring Alarm

The Ring Alarm Window and Door Contact Sensor is a single white unit that mounts on any door or window frame. It pairs with a Ring Alarm or Alarm Pro base station to send real-time mobile alerts whenever the monitored entry point opens. This accessory is designed for homeowners expanding an existing Ring security system with additional perimeter sensors.

Check Compatibility and Battery Access

This sensor requires a Ring Alarm or Alarm Pro base station sold separately; it will not function as a standalone device. Verify that your current kit includes the base station before ordering. The unit ships with two CR2032 coin cell batteries included, so confirm you can access the battery compartment for replacement after roughly three years of use.

Battery Power and Silent Operation

Power comes solely from the two included CR2032 batteries, which may last up to three years depending on usage and temperature. Cold conditions can reduce that lifespan. The sensor has no fan or moving parts, so it runs silently and draws no mains power, adding no heat or noise to the room where it is installed.

Highlights

  • Get instant mobile alerts when doors or windows open
  • Triggers the Alarm system if a sensor is tampered with
  • Easy DIY installation with no tools required
  • Compact design enables more placement options
  • Powered by two CR2032 coin cell batteries included

Specifications

BrandRing
ModelAlarm Window and Door Contact Sensor
SpecificationsSUPPORTED DEVICES
Setup Requirement: Requires Ring Alarm or Alarm Pro (sold separately)
FeaturesPOWER AND CONNECTIVITY
Power: 2 CR2032 Coin cell batteries
Battery Life: Uses two CR2032 batteries, included, which may last up to 3 years depending on usage. Cold temperatures may drain battery life faster.
Operating Conditions: 32 degrees F to 120 degrees F (0 degrees C to 49 degrees C)
Connectivity: Z-Wave (250-foot range to Base Station open air, line of sight)
INSTALLATION:
Operating Conditions: Indoor use
Mounting: Mounts to doors and windows
Maximum Distance Between Magnet and Sensor: 1 inch. Leave 1/2" space on non-magnet side to access battery compartment.
Shipping weight5.87 kg
Package size127 × 102 × 51 mm

Questions about this item

What comes in the box and what must be bought separately?

The pack includes one contact sensor and two CR2032 batteries. A Ring Alarm or Alarm Pro base station is required and sold separately.

Which version or capacity should I choose?

This is a single-pack white sensor; buy additional single packs for each extra door or window you want to monitor.

What does the three-year battery-life claim mean once the sensor is installed?

The two included CR2032 cells may last up to three years under normal use, but cold temperatures can shorten that span.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.