A compact breakaway pulley can reduce the number of approaches that have to be made when remotely moving a device.  The Detonation Technology Breakaway Pulley is small, measuring 3″x1.25″x.5″; light weight, at 2.6oz; and durable, being made entirely from Stainless Steel and Delrin.  The updated Gen 2 pulley can now be used with the line running in either direction, rather than only from right to left as with the original design. 
The pulley break action is triggered by a not in the line or by "biting" a carbiner or similar in to the line at the appropriate point.