# How Amazon Tracks Warehouse Workers' Hands Using Radio Waves

> A system that uses radio frequency signals to track the exact 3D position of a warehouse worker's hand to ensure they pick or place items in the correct bins.

- **Patent:** US 9881277
- **Original title:** Wrist band haptic feedback system
- **Owner:** Amazon Technologies Inc
- **Granted:** 2018
- **Status:** Active
- **Times cited:** 7
- **Field:** consumer_electronics, telecommunications, mechanical

## What it does

This system uses a wearable device on a worker's hand that acts like a beacon. Fixed antennas around the warehouse send radio signals to this device, which sends a response back. A computer uses these signals to calculate the hand's exact location in 3D space. By comparing this location to a digital map of inventory bins, the system can tell if a worker is reaching into the right bin for a specific task. It can even provide haptic feedback (vibrations) to guide the worker's hand toward the correct bin.

## What it does NOT cover

- Does not cover systems that rely solely on cameras or computer vision for tracking.
- Does not cover tracking methods that use GPS or outdoor satellite positioning.
- Does not cover inventory management that relies on manual barcode scanning by the worker.
- Does not cover systems that track the worker's location without specifically monitoring the hand's proximity to inventory bins.

## The clever bit

The innovation lies in using RF triangulation to create a real-time, high-accuracy 3D map of a human hand's movement, turning the worker themselves into a tracked node within an automated inventory network.

## Real-world examples

1. Amazon fulfillment center worker wearable wristbands
2. Automated warehouse picking guidance systems

## Why it matters

This patent represents a shift toward high-precision, automated oversight in massive logistics centers. By removing the need for workers to scan items manually, companies can theoretically increase the speed and accuracy of order fulfillment. It is a core component of the drive to optimize human movement in environments like Amazon's fulfillment centers.

## Frequently asked questions

### What does How Amazon Tracks Warehouse Workers' Hands Using Radio Waves cover?

A system that uses radio frequency signals to track the exact 3D position of a warehouse worker's hand to ensure they pick or place items in the correct bins.

### Who owns patent US 9881277?

Amazon Technologies Inc owns this patent, granted in 2018.

### When does this patent expire?

This patent is expected to expire on January 30, 2038, when the invention enters the public domain.

### What is patent US 9881277 cited by?

This patent has been cited by 7 later patents that build on its ideas.

### What problem does this patent solve?

This patent represents a shift toward high-precision, automated oversight in massive logistics centers. By removing the need for workers to scan items manually, companies can theoretically increase the speed and accuracy of order fulfillment. It is a core component of the drive to optimize human movement in environments like Amazon's fulfillment centers.

### What does this patent NOT cover?

Does not cover systems that rely solely on cameras or computer vision for tracking.

**Full plain-English explainer:** https://patentbrief.org/patent/us/9881277/amazon-robotics-kiva-systems

**Original patent:** https://patents.google.com/patent/US9881277

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._