This is my V1 attempt at a MINI tracer box for the AAA housing. you will need to make the mini tracer, follow the included video. also you need to buy a 4xAAA to 9v adapter housing.
http://www.componentshop.co.uk/battery-holder-for-4-aaa-batteries-square-pp3-clip.html
http://www.componentshop.co.uk/pp3-standard-lead.html