Replica pressure release switch Improvised Explosive Device (IED), 2013. 
This is an example of a pressure release switch IED, commonly used by insurgents during the Afghanistan campaign to target IED Disposal Operators disarming devices manually. Attractive objects are usually placed on top of the switch to persuade individuals to move the object and cause the device to function. 
Associated with Operation HERRICK, Afghanistan (2002-2014). 2004- .