table, th, td {border: 1px solid #ddd;border-collapse: collapse;}table {width: 100%; }td {width: 50%; padding: 8px;} tr:nth-child(even){background-color: #f2f2f2;} Assembly Required Mount across a path or doorway. When a person or object breaks the beam the loudspeaker will sound.•Kit includes PCB, LDR, speaker and all components.•12VDC power required. Instructions sold separately or withing the Short Circuits book range, Short Circuits Books are available for Download Here For More Information on Kids science/electronics projects Click Here for Kits for Kids Assembly required Specifications: Kit Form Short Form (circuit only) Kit Group Short Circuit Series Difficulty Simple Application Field Electronic eye Contains High Voltage Components No Instructions Included No PCB Width 61mm PCB Length 105mm Project Number(s) 3 Volume Number Volume 3 Downloads