DIY Door Sensor Alarm Kit – Adjustable Time Delay | Full Kit

Keep your home, office, or workspace secure with this DIY Door Sensor Alarm Kit. Featuring a fully adjustable time-delay system, this kit activates a buzzer alert whenever a door is left open beyond your chosen delay period — giving you flexible, low-cost access monitoring without complicated wiring or installation.

Made in Mainland China.

How It Works

When a monitored door is opened, the built-in delay timer begins counting. If the door is not closed within your preset delay period (0 seconds to 60 minutes, fully adjustable), the buzzer activates and continues sounding until the door is shut. It's that simple — no false alarms, no complex programming.

Adjustable Delay Ranges

• 0 – 30 Seconds (adjustable)
• 30 Seconds – 1 Minute (adjustable)
• 1 Minute – 5 Minutes (adjustable)
• 5 Minutes – 10 Minutes (adjustable)
• 10 Minutes – 30 Minutes (adjustable)
• 30 Minutes – 60 Minutes (adjustable)

Please leave a message at checkout specifying your desired delay range.

Key Features

• Wide delay range: Fully adjustable from 0 seconds up to 60 minutes to suit any scenario
• Low power consumption: Energy-efficient design for cost-effective, continuous use
• Stable & reliable: Engineered for safe, consistent operation with minimal false triggers
• Easy DIY installation: Complete kit with all components included — no extra tools needed
• Broad application: Ideal for residential homes, offices, factories, schools, and other commercial spaces

What's in the Box

• Buzzer / Buzzer Indicator Lamp
• 12V Power Adapter
• Delay Relay (normally open type)
• Magnetic Switch (open conduction)

Specifications

• Model: DR12
• Power Supply: 12V DC (adapter included)
• Delay Range: 0 seconds – 60 minutes (adjustable)
• Switch Type: Normally open magnetic switch
• Application: Doors in residential, commercial, and industrial settings

For guidance on home security best practices and door safety, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What delay range does this door sensor alarm kit support?

A: This DIY door sensor alarm kit supports a fully adjustable delay range from 0 seconds all the way up to 60 minutes. You can select from six preset delay ranges (0–30s, 30s–1min, 1–5min, 5–10min, 10–30min, or 30–60min) — just leave a message at checkout with your preferred range.

Q: Is this kit difficult to install?

A: Not at all! This is a complete DIY kit that comes with all the components you need, including the buzzer, 12V power adapter, delay relay, and magnetic switch. No advanced electrical knowledge is required — it's designed for straightforward self-installation.

Q: Where can this door alarm kit be used?

A: This door sensor alarm kit is versatile and suitable for a wide range of settings, including residential homes, offices, factories, schools, warehouses, and any other space with doors that need to be monitored for being left open.

Q: Will this alarm trigger false alerts frequently?

A: No. This kit is engineered for stable and reliable performance, with a low-power, low-cost design that minimizes false triggers. The magnetic switch activates only when the door is genuinely left open beyond your set delay period.