Usongs Magnifier 4x LED Light Clip Clamp Helping Hand Free Type Loupe Magnifying Glass Useful Aid for Soldering Work or Model Maker 3 pcs of AAA batteries (not included), large capacity, this model can continuously discharge more than 10 hours, expediently be used Material of lens: Glass Lens Diameter: G2.56 inch / 65mm Weld holder size: G1.18 x 3.54inch / 3 x 9cm (D x H). Base size: G3.93 x 2.56 x 0.79inch / 10 x 6.5 x 2cm (L x W)