The Set consist of: diode laser 635nm - Pmax = 1mW/ laser class: 2 mounted in adjustable holder 2pcs mirrors mounted in adjustable holders semitransparent mirror mounted in holder polarizing filter lens image screen mounted in holder ground screen mounted in holder set of diffraction and interference structures hologram mounted in holder plastic carrycase power supply: 100-240V AC/ 3V DC battery box (2x 1.5V AA battery type) 2pcs universal holder holder of polarizing filter or lens