The device consists of a belt-buckle form factor with an attached pair of chains. One chain connects to the user’s shirt and one dangles below the device. Tugs on the bottom chain are transmitted to a paired belt and represented as tugs on the chain connected to the shirt itself. Each belt also has a button on it to interrupt a tug in process.
Source: Harry, D. 2007. Tug n'Talk: A Belt Buckle for Tangible Tugging Communication Abstract. Presented at alt.chi 2007.
http://web.media.mit.edu/~dharry/tugandtalk/