Mini Magnetic Reed Module – KY-021

  • Mini Magnetic Reed Module - KY-021
  • Mini Magnetic Reed Module – KY-021
  • Mini Magnetic Reed Module - KY-021
  • Mini Magnetic Reed Module – KY-021
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The KY-021 Mini Magnetic Reed Module is a simple module that is a magnetic sensor which is normally open and closes when exposed to a magnetic field.

The KY-021 Mini Magnetic Reed Module has a 10k Ohm resistor and a reed switch that is activated by a magnetic field, with the digital output pin going to HIGH (+5V). The module has an onboard LED which is activated when the module is in the closed state.



  • Operating voltage: 3.3V – 5V
  • Output type: Digital
  • Dimensions: 20mm x 15mm x 7mm

Pin Specifications:

  • Pin 1: Analogue out
  • Pin 2: GND
  • Pin 3: VCC (+5V)
  • Pin 4: Digital Out



  • 1 x Mini Magnetic Reed Module – KY-021

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We ship Australia wide to all addresses, including PO Box, Parcel Locker, etc.

The following shipping options available are listed below:

Australian Orders

  • Standard Shipping – Free (low cost / small products) – Sent via standard Australia Post stamped mail, 3 – 7 business days delivery depending on location, minimal tracking.
  • Standard Shipping – Free (higher cost / larger products) – Sent via Australia Post Parcel Service or Courier Service, depending on location and mailing address, 2 – 5 business days delivery, with full tracking.
  • Express Post – $12.00 (Cost may be higher depending on product size) – Sent via Australia Post Express Service, 1 – 2 business days for metro orders, potentially longer for orders outside of metro zones, with full tracking.

Orders outside of metro orders can take 2+ days longer than the estimates stated above.

International Orders

Shipping costs for international orders vary depending on location and package size, where possible we have kept this to flat rate charges to reduce confusion.

International orders are shipped through Australia Post and Sendle courier service depending on the most economical at the time.

Pick Up
In-person pickup is currently not available. If the order is urgent, please contact us to see what can be arranged.

If you have any questions, please have a look at the customer service portal where you will find answers to many common questions, or you can reach out to us through the contact us page.

More Information

If you would like more information regarding placing international orders, please view the faq page under the “Do you accept international orders?” section.