This kit is a black Hammond 1593QBK plastic enclosure packaged together with a matching ProtoBoard 2-hole per strip PCB.The hand-held electronic case has a battery compartment for 1xAA, 2xAA, 1 to 4 AAA, or 1x9V battery (battery holder not included).  It has a long life "three snap" battery door, PCB standoffs, and a removable end panel.  It has a recessed top for membrane overlay or keypad.  Lap joint construction provides protection against dust accumulation and splashing water. The PR1593Q prototyping circuit board (PCB) has the convenient 2-hole ProtoBoard pattern, which provides an easy way to connect parts while maximizing usable board area.