Projection stage 285mm x 285mm (A4) Power source 220V/230V/240V, 50Hz, (optional 110V/60Hz) Projection lamp Dual halogen lamp, EHJ 24V 250W/ EVD 36V 400W Light output EHJ 24V 250W 36V 400W Cooling Low-noise dual cross flow fan <30dB Projection lens 3-element lens, varies-focal, f=280~340mm Projection mirror Aluminum vapor, quartz-protected surface, with 30°elevation High-speed lamp changing system Yes, supported by 2 micro safety switches Overheating protection Yes, thermostatically controlled Measurement 420 x 320 x 475mm Folded measurement 420 x 320 x 110mm