My First Lab Mega Duo Microscope. Gently used. Smoke free environment. 1. 10X eyepiece with real optical glass lenses 2. 4X, 10X, 40X objectives with 40X, 100X, and 400X laboratory-grade glass lenses. 3. Dual focusing knobs. 4. 2 different light control settings 5. Battery operated cordless model fits 3AA batteries (not included)