ACM made copy of TM's newest tracer unit. Metal outer, only 132mm long, it has a neat push switch recessed into the rear of the unit.
Although supplied with 4 Energizer AAA batteries, we cannot guarantee that these will still be holding a charge when they arrive with you. 

Please don't chuck old batteries in the bin, they should be recycled properly at your local supermarket when you next go.
To replace the batteries, unscrew the unit at the switch end, and remove internal tracer unit. The battery compartment is at the muzzle end and opening it is a simple press & twist in the direction indicated by the moulded arrow.

 please recycle responsibly!