The Nike+ FuelBand is an activity tracker that is worn on the wrist.

Privacy extensions do little to protect the user from tracking if only one or two hosts are using a given network prefix, and the activity tracker is privy to this information.

The Fitbit One and the Fitbit Zip were the first wireless activity trackers to sync using Bluetooth 4.0 or Bluetooth Smart technology.

Some products in this area have fallen flat, like Jawbone's Up, a wristband activity tracker that had so many technological problems that Jawbone is offering full refunds to dissatisfied customers.

According to its author, Circe incorporates ideas from ERC such as its activity tracker and others; it was developed as ERC became "difficult to debug and improve."

This three-booklet package helps people assess their risk for developing diabetes and implement a program to prevent or delay the onset of the disease and it includes an activity tracker and a fat and calorie counter.

Early versions of ThoughtFarmer included features such as profiles, commenting, tagging, search, recent activity tracker, news feed on the home page, document management, wiki-style content editing and revision control, Microsoft integration, organizational chart, rich-text editor, and an employee directory.

"Now that the Cardassian vessel is on the other side of the wormhole, we've been able to trace its position with our remote monitoring devices- plus, unknown to them, and thanks to the efforts of our chief engineer and security officer, they're carrying aboard a couple of miniaturized activity trackers.