Instead of Qi, Duracell's Powermat uses a magnetic inductive charging technology championed by the PMA. As a benefit, the PMA is partnering with stores like Starbucks to provide wireless power stations for customers.
The Powermat needs to be coupled with a Duracell wireless case in order to work ($49.99 for an iPhone 5/5S, $25.99 for an iPhone 4/4S or a Samsung Galaxy S III). An audible beep tells you charging has started successfully and another sounds when your device is fully powered -- the Powermat then stops to avoid overcharging your batteries.
A Powermat for one device measures 3.75 x 3.75 x 0.37 in.; larger versions accommodate up to three devices.