Defunct Jawbone fitness trackers kept selling after app closure, says Which

When Jawbone liquidated its assets, its wristbands became useless without companion app

Fitness trackers made by the defunct wearables company Jawbone were still on sale at Amazon, Selfridges and Groupon more than a month after they were rendered useless by the closure of a companion app, according to research by the consumer magazine Which.

The Jawbone UP2, first released in 2015, is a wrist-worn fitness tracker. It connects to iOS and Android phones through Bluetooth, and uploads its data to a companion app, also branded UP. But in 2017, after a run of bad financial results, the company liquidated its assets, and earlier this year it disabled the app entirely.