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Ring Alarm Contact Sensor Review: Simple, reliable entry alerts

Ring Alarm Contact Sensor (2nd Generation)
4.5
[Instant Open Alerts]  Receive real-time notifications when doors or windows open.
[Compact Slim Magnet]  Slim removable magnet and compact design for installs where space is limited.
[Tool-Free Installation]  Quick, tool-free setup for fast mounting on doors and window frames.
[Ring Alarm Compatible]  Requires Ring Alarm Base Station; works with 1st and 2nd generation devices.
[Battery & Alexa Alerts]  Uses 2x CR2032 batteries; Alexa notifies you of low battery status.
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Home security accessory that sends real-time notifications the moment a door or window opens. Perfect for households that want straightforward, dependable entry alerts and greater peace of mind. Is Ring Alarm Contact Sensor the practical choice for every Ring-equipped home?

⚡ At a Glance
  • Detection Speed: Instant recognition of open and closed states with prompt mobile alerts
  • Best for: Homeowners and renters looking for simple, dependable entry notifications
  • Not ideal for: Properties that do not use a Ring Alarm Base Station

Compact contact sensor with a slim removable magnet and tool-free installation. Requires a Ring Alarm Base Station and runs on 2 x CR2032 batteries.


Immediate entry alerts - with real-time open and close detection

Magnet separation is detected and the event is reported to the Ring Alarm Base Station, which relays notifications to linked apps. Notification flow relies on established Ring Alarm communications rather than standalone operation.

Receive an alert exactly when a door or window opens so you can react quickly to unexpected activity. Ideal for monitoring deliveries, visitors, and securing access points.

Discrete fit - with a slim removable magnet

A more compact design and a slim removable magnet allow placement in narrow door and window frames where bulkier contacts would not fit. The slim magnet reduces visible protrusion when mounted.

Keep sensors out of sight on narrow frames without compromising detection, preserving the look of doors and windows. Suitable for modern or period homes where appearance matters.

Fast set-up - with tool-free installation

Tool-free mounting uses adhesive or simple fixtures so the sensor and magnet attach quickly to doors and window frames without specialist tools. Mounting positions are straightforward for common entry points.

Get the system working within minutes, a clear benefit for renters or anyone avoiding DIY jobs. Simple installation makes it easy to expand a Ring Alarm system room by room.

✨ The 4 Key Reasons for Ring Alarm Contact Sensor
  1. Slim removable magnet - Fits narrow frames and stays discreet in tight gaps
  2. Tool-free installation - Mounts in minutes without drilling or specialist equipment required
  3. CR2032 coin-cell power - Standard batteries are easy to replace and widely available
  4. Ring Alarm compatibility - Connects with 1st and 2nd gen Alarm systems for unified alerts
📋 Technical Details at a Glance
  • Category: Home security contact sensor
  • Brand: Ring
  • Model: Alarm Contact Sensor
  • Generation: 2nd Generation
  • Compatibility: Compatible with 1st and 2nd generation Ring Alarm devices and accessories
❓ Frequently Asked Questions

Q: How does the sensor alert me when a door or window opens?

A: Magnet separation is detected and the event is sent via the Ring Alarm Base Station, which triggers real-time notifications to linked devices. The notification path relies on an active Ring Alarm system.

Q: Do I need a Ring Alarm Base Station to use the sensor?

A: Yes, the contact sensor requires a Ring Alarm Base Station and is compatible with 1st and 2nd generation Ring Alarm devices and accessories.

Q: What kind of batteries does it use and how reliable is the power?

A: The sensor uses two CR2032 lithium coin cells, and user feedback highlights long-lasting battery life and efficient power usage; Alexa can also notify when batteries run low.

🏆 Our Verdict

Suitable for homeowners and renters who already use or plan to use a Ring Alarm system and want unobtrusive, dependable entry alerts. Slim removable magnet, simple tool-free installation and reliable notifications make it an easy addition to a Ring security setup. While individual budgets vary, compatibility with existing Ring systems and low-maintenance batteries should deliver steady long-term value.