The reflector telescope uses a curved mirror to gather and focus light. This telescope has an aperture of 114mm (4½") and a focal length of 900mm. 3 Plossol eyepieces are included (6.5mm, 10mm, 25mm), as well as a 2x Barlow lens. Total magnification is 277x with the 2x Barlow lens. Also comes with accessory tray and 2 year warranty.