Not All Touchless Door Release Buttons Are the Same: Understanding the Differences

Touchless door release buttons have become a standard feature in modern access control systems, offering users a convenient and hygienic way to exit secured areas. As adoption continues to grow, many assume that all touchless buttons operate in essentially the same way. After all, if a simple wave of the hand opens the door, does the technology behind it really matter?

Recent discussions around smartphones unintentionally triggering certain infrared-operated devices suggest otherwise. What appears to be a simple touchless button can behave very differently depending on the sensing technology used behind the scenes.

For consultants, system integrators, facility managers, and building owners, understanding these differences is becoming increasingly important as expectations for reliability, security, and user experience continue to evolve.

Beyond Touchless Operation

The primary purpose of a touchless door release button is simple: enabling users to activate a door without physical contact. As these devices become more widely adopted, many assume they all work in the same way.

In reality, the sensing technology behind a touchless door release button can have a significant impact on how it behaves in daily operation. The difference is not what users see, but how the sensor interprets their actions.

Among the most widely adopted technologies are Microwave (Radar) sensing and Infrared (IR) sensing. Although both enable contactless operation, they are designed around different detection principles and priorities.

Different Technologies, Different Priorities

Microwave and infrared buttons both open a door without contact, but they detect the user in very different ways.

Microwave (radar) door release buttons

Microwave buttons use high-frequency radio waves to detect motion across a designated area. They typically respond from up to several metres away, and the range can be adjusted.

Where microwave works well

• Hygiene: No surface contact, which reduces the spread of germs in high-traffic or sterile areas.

• Accessibility and convenience: A wave of the hand or a simple body movement is enough, which helps people with disabilities and anyone carrying items.

• Sensitivity and range: Detects motion from further away and across a wider angle than a standard IR button.

• Concealed installation: Can detect motion through thin non-metallic materials such as glass, plastic and drywall, so the sensor can be hidden or protected.

• Durability: With no moving mechanical parts and no physical impact from users, microwave buttons tend to last longer than traditional push buttons and need little maintenance.

What to consider

• Accidental triggers: Because the sensor responds to any motion, passing traffic or nearby movement can cause "ghost openings".

• Wide motion area: Standard radar picks up general movement nearby, so people just walking past can accidentally trigger the door. Doors may open unnecessarily and waste energy.

• Cost: Microwave buttons are generally more expensive to buy and install than push buttons or simpler infrared switches.

• Power dependency: They need a constant power supply to emit and read radar waves, unlike a mechanical switch (a backup battery can reduce this risk). 

• Interference: Environmental factors such as heavy vibration or large metal objects nearby can sometimes cause false triggers.

Infrared (IR) door release buttons

Infrared buttons take a more focused approach. They detect proximity by sensing the reflection of infrared light at a close point, typically at a distance of about 5 to 20 cm. The user has to make a deliberate wave near the button, so passersby are far less likely to trigger the door.

Where infrared works well

• Precision: A close-range, intentional gesture means fewer accidental openings.

• Hygiene: Fully touchless, like microwave.

• Durability: Solid-state, with far less wear than mechanical buttons.

• Cost: Usually lower than microwave.

What to consider

• Short range: The user needs to reach the sensing point, which may be less convenient for someone with their hands full.

• Direct sensing path: The sensor needs an unobstructed path, so it can't be hidden behind a wall or glass the way microwave can.

• Environment: Strong direct sunlight or heavy optical obstruction can affect performance.

An important distinction: a smaller sensing zone reduces accidental triggers from movement, but it is a separate matter from how well a sensor handles unwanted signals, such as stray infrared light from other devices. This is where signal design, such as encryption, makes the difference.

Why Precision Matters

Recent discussions surrounding smartphones and other consumer devices emitting infrared signals have drawn attention to a topic that many people had never previously considered: the ability of a sensor to distinguish between an intentional activation request and an unintended signal. While these situations may not occur every day, they highlight the importance of understanding how sensing technologies behave under real-world conditions. 

Cases involving unintended activations have prompted more organisations to look beyond detection range and consider how a sensor behaves in real-world environments. In many commercial and security-conscious environments, predictable operation is often preferred over maximum sensitivity.

These considerations have led many project teams to explore Infrared-based door release solutions for environments where greater activation control is desired. By relying on a defined sensing zone, IR technology offers a more controlled activation experience that aligns well with the requirements of offices, restricted areas, data centres, and other access-controlled environments.

At the same time, advances in Infrared sensing technology continue to improve reliability and resistance to unintended activations, helping organisations maintain a touchless experience without sacrificing operational control.

Choosing the Right Fit

The best touchless door release button is not necessarily the one with the longest detection range or the highest sensitivity. It is the one that best aligns with the requirements of the environment.

For projects where broad coverage and effortless activation are the primary goals, microwave technology may be an appropriate choice. For projects that prioritise controlled operation, activation accuracy, and predictable behaviour, infrared technology can offer significant advantages.

As touchless solutions become a standard component of modern access control systems, understanding how different sensing technologies operate is becoming just as important as selecting the right reader, credential, or management platform.

ACX's infrared door release buttons have used encrypted signalling since 2025. See how they perform in our interference test , then talk to us about the right fit for your project.

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