Walmart Deploys Millions of Battery-Free IoT Sensors Across its Supply Chain

Walmart is deploying millions of ambient Internet of Things (IoT) battery-free sensors throughout its massive U.S. supply chain. This represents a significant step towards real-time inventory visibility and improved supply chain efficiency.

What is Ambient iot?

Ambient IoT is a new class of IoT devices that primarily draw power by harvesting ambient energy from sources like radio waves,light,motion,or heat. This differs from traditional IoT devices that rely on batteries or wired power sources.It’s an evolution of both traditional IoT and Radio Frequency Identification (RFID) technologies, offering the potential for lower costs and greater scalability.

Key Differences from traditional IoT and RFID

• Traditional IoT: Requires batteries or a constant power source, increasing costs and maintenance.
• RFID: Typically requires a reader to be in close proximity to the tag, limiting range and real-time tracking capabilities.
• Ambient IoT: Operates without batteries, leveraging ambient energy, and offers broader range and continuous monitoring.

Walmart’s Implementation with Wiliot

walmart is partnering with Wiliot to implement this large-scale deployment, which Wiliot calls the first of its kind in the retail sector. The rollout will focus on tracking pallets nationwide, with completion expected by the end of 2026. Expansion to other global markets is being considered after the U.S. rollout is complete.

Benefits for Walmart

the implementation of thes sensors will provide Walmart with unprecedented real-time insights into its inventory. Specifically, Walmart will be able to:

• Track Inventory Location: Know the precise location of merchandise at any given moment.
• Monitor Ownership: Determine whether the merchandise is owned by Walmart or is in transit.
• Improve Inventory Management: Optimize stock levels and reduce waste.
• Gather Environmental Data: Capture data on temperature, humidity, and dwell time, ensuring product quality and safety.

At full scale, the system will monitor an estimated 90 million pallets of inventory.

How the Sensors Work

The ambient IoT sensors used by Walmart capture signals related to temperature, location, humidity, and how long an item has been in a specific location (dwell time). These signals are transmitted wirelessly, providing a continuous stream of data to Walmart’s systems. Because they are battery-free, they considerably reduce maintenance costs and environmental impact.

Looking Ahead

Walmart’s deployment of ambient IoT sensors represents a major advancement in supply chain technology. This initiative could set a new standard for inventory management and visibility in the retail industry, and other companies are likely to follow suit as the technology matures and becomes more cost-effective. The ability to track goods in real-time, combined with environmental monitoring, will be crucial for optimizing supply chains and meeting evolving consumer demands.

Publication Date: 2025/10/15 16:15:22