What: Amazon has developed a new version of its cashierless shopping technology for clothing retailers, called Just Walk Out.

Why it is important: The implementation expands the potential applications of the system beyond convenience and grocery stores, allowing for more efficient tracking of apparel items.

The technology uses radio frequency identification (RFID) tags to track apparel items. This is a departure from Amazon's previous system, which relied on cameras and shelf sensors. The RFID tags are affixed to individual items and monitored by fixed readers inside the store.

While Amazon has successfully deployed Just Walk Out in convenience stores and grocery outlets, it's unclear how many apparel retailers will adopt the RFID version due to concerns about relying on a competitor for in-store technology.

Amazon has conducted pilot tests of its RFID-enabled technology at fan shops in Seattle sports arenas.

Amazon develops version of cashierless tech for clothing stores