Red Laser Pointer 1.Wavelength: 650 nm 2.Size:9.60 x 142.00mm 3.Power output: < ... .Expected Life: over 5,000 hours 5 x 3-in-1 Red Laser Pointer Beam Light + PDA Pen + ... power situation).* Press-button-operating Switch.* Perfect for teachers, students, engineers, doctors, managers and more ... handy design, very convenient to put in bags or pockets.* Useful kit for handy torch, office/school presentation, ...