On Kickstarter, there is a campaign for a RFID tag of sorts. It works with Bluetooth LE and is powered by energy harvesting the 2.4 gigahertz band. With clear line of site, they claim a range of 200 feet.
The product is called iFind and the company is WeTag.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.