Features:1. 5 Replaceable/Interconvertible lens with different magnifications marked in the middle.2. LED light can be rotated about 60 degree and light source box with battery compartment is detachable.3. Adjustable head band ensures more comfortable and tight head wearing.4. Light source box can be used separately as lighting source after being dismantled.5. Widely used in mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving, etc. Specifications:Single-plate lens magnifications: 1.0x, 1.5x, 2.0x, 2.5x, 3.5x.Bi-plate lens magnifications: 3.0x, 4.0x, 4.5x, 5.0x, 5.5x, 6.0x.Table below denotes the distance proportion between magnifications and viewed objects: Magnifications Distance to viewed objects1.0x 300 ~ 350mm1.5x 240 ~ 260mm2.0x 215 ~ 235mm2.5x 205 ~ 225mm3.0x 160 ~ 180mm3.5x 135 ~ 145mm4.0x 125 ~ 135mm4.5x 110 ~ 130mm5.0x 100 ~ 120mm5.5x 80 ~ 95mm6.0x 60 ~ 85mmLED: 2 PiecesLens: 5 PiecesBattery: 3 * 1.5V AAA batteries (NOT included)Head circumference: AdjustableMaterial: ABS (Acrylonitrile Butadiene Styrene)Applications: Timepiece repair, jewelry appraisal, miniature engraving, etc.Color: Black + WhitePackage size: Approx. 26* 20 * 7cm / 10.23* 7.87 * 2.76in Package includes:1 * Head-mounted magnifier with LED5 * Lens1 * User manual