Model: 1500 Specification : A precision optical instrument for accurate refraction. It provides 30 different charts and 35 masks, with programmable remote control. Duochrome test charts to check single and binocular vision, and polarized test charts to check binocular vision and ocular muscle imbalance. It provides 30 different charts and 35 masks, with programmable remote control. Duochrome test charts to check single and binocular vision, and polarized test charts to check binocular vision and ocular muscle imbalance. Projection distance: 1.5m-7m Projection Magnification : 30x(at 5m) Projection size : 330mm(W) x270mm(H) (at 5m) Chart Switching speed: 0.01-0.02S Mask Number: lopen,5 horizontal lines,8 vertical lines, 21 single letters,1 red/green Mask Switching speed: One mask per 0.01-0.02s Program : 2 sets programs, each program contains up to 30 steps Lamp : 12V,50W(halogen lamp) /12V,10W(LED) Power saving function : Will automatically standby in 10 min Standard accessories : Remote control, Polarized metal screen, halogen lamp, Polarized glasses, fuses(2), batteries(2) Optional accessories : Floor stand, wall stand