Verified

Ring

Ring Alarm Contact Sensor (2nd Gen)

Name: Ring Alarm Contact Sensor (2nd Gen)
Brand: Ring

Model: 4SD2SZ-0EN0

Slim door/window sensor with 3-year battery for Ring Alarm system.

Alexa

BatteryRequires Hub

Compatibility

Platform Compatibility

Alexa

Google Home

HomeKit

SmartThings

Matter

Home Assistant

IFTTT

Requires a hub (sold separately)

Connectivity

WiFi

Zigbee

Z-Wave

Thread

Bluetooth

Bluetooth LE

Infrared

Specifications

Physical

Power Source: Battery
Battery Type: CR2032
Battery Life: 3 years
Dimensions: 28mm × 53mm × 14mm
Colors: White
Indoor/Outdoor: indoor

Sensors Specs

Range: 76
Magnet Gap: 25
Range Unit: m
Sensor Type: Contact
Battery Count: 2
Magnet Gap Unit: mm
Operating Temp: [object Object]
Z Wave Frequency: 908/916 MHz

Features

Energy Monitoring

Scheduling

Voice Control

Timer

Away Mode

Physical Button

LED Indicator

LED Customizable

OTA Updates

Local API

Compact Design

Subscription

An optional subscription unlocks additional features.

$10/month

Free Features

• Real-time alerts
• Entry/exit notifications
• Alexa integration

Paid Features

• Professional monitoring
• Cellular backup
• 24/7 support

Pros & Cons

Pros

3-year battery life
Slim, unobtrusive design
Reliable Z-Wave connection
Easy installation

Cons

Requires Ring Alarm Base Station
No Google Home or HomeKit support
Indoor use only

Best For

Ring Alarm system ownersDoor/window monitoringLong battery life needs

Product Details

The Ring Alarm Contact Sensor (2nd Gen) provides instant alerts when doors or windows open. With a slim design that fits any frame and a 3-year battery life, it's a reliable component of the Ring Alarm security system. Uses Z-Wave for secure communication up to 250 feet from the Base Station.