The box contains a small board based on an ATMEGA328P-PU chip and supporting components, including a MOSFET to reduce power consumption while in sleep mode. The code was developed on an Arduino Uno. When powered up by 4 x AA cells, the box can remain idle for several months while it waits to be activated. Once the switch is turned on, the lid opens and an arm switches it off again. Both the arm and lid are controlled by small low powered servos and they operate in a sudo-random sequences each time the switch is activated.