4M KidzLabs Intruder Alarm: Build Your Own Working Security System

The 4M KidzLabs Intruder Alarm Kit lets children build a working alarm system that sounds when a door, drawer, or locker is opened. Children assemble the circuit and contact plates themselves, following detailed diagram instructions, then fit the finished alarm using the double-sided sticky foam mounting pads provided, with no drilling needed.

How It Helps

Children follow the step-by-step diagrams to build the alarm's circuit, then fit it to a bedroom door, drawer, or personal locker using the included mounting pads. Suitable for children aged 8 and over, the build typically takes around an hour to complete, giving a genuine sense of achievement once the finished alarm is triggered for the first time.

• Builds a genuine working alarm using a circuit and metal contact plates
• Sounds an alarm when a door, drawer, or locker is opened
• Fits using double-sided sticky foam pads, with no drilling required
• Detailed diagram instructions support step-by-step assembly
• Gives children a personal security project for their own bedroom or belongings

Building a circuit that genuinely triggers an alarm gives children a clear, practical result from their assembly work, helping make the underlying electronics concepts easier to understand than reading about them alone.

Whether fitted to a bedroom door to keep siblings out or used as a hands-on electronics project, the Intruder Alarm Kit offers an engaging way to combine building and personal security.

• Circuit-based alarm mechanism using metal contact plates to trigger a sound
• Double-sided sticky foam mounting pads included, so no drilling is required
• Detailed diagram instructions support step-by-step assembly
• Typical build time of around an hour
• Suitable for children aged 8 years and over
• Brand: 4M, from the KidzLabs range

• A genuine working alarm. Children build a real circuit that sounds when a door, drawer, or locker is opened.
• No drilling required. Double-sided sticky foam pads mean it can be fitted without damaging doors or furniture.
• A satisfying one-hour build. Detailed diagram instructions guide children through assembly at a manageable pace.
• A genuinely useful result. Unlike many kits, the finished alarm has a real, everyday use once built.

Compatibility

Designed for use on bedroom doors, drawers, or personal lockers using the included double-sided sticky foam mounting pads, rather than for fitting to external or main household doors.

Safety and Age Suitability

Suitable for children aged 8 years and over. Contains small parts. Adult supervision is recommended during assembly, particularly when working with the circuit and contact plates.

Delivery and Returns

Standard UK delivery applies. See our Delivery and Returns page for full details.

• What is the 4M KidzLabs Intruder Alarm Kit?
  It is a build-it-yourself alarm kit that uses a circuit and metal contact plates to sound an alert when a door, drawer, or locker is opened.
• How does the alarm work?
  Metal contact plates complete a circuit when the door or drawer is opened, triggering the alarm to sound.
• What age is this kit suitable for?
  The kit is designed for children aged 8 years and over. Younger children may need adult help with assembly.
• Can it be fitted without drilling?
  Yes, the kit includes double-sided sticky foam pads for mounting, so it can be fitted to a door, drawer, or locker without drilling.
• How long does it take to build?
  Assembly typically takes around an hour, following the detailed diagram instructions provided in the kit.
• Is adult supervision needed to build the alarm?
  Adult supervision is recommended, particularly for younger children, during assembly of the circuit and contact plates.
• Is this suitable for a main external door?
  The kit is designed for internal use, such as a bedroom door, drawer, or personal locker, rather than for fitting to external or main household doors.