40-piece beginner biological microscope kit offers 120X, 240X, 300X, 480X, 600X and 1200X magnifications. Durable metal arm with stage, clips and rack and pinion focusing. Built-in LED electrical illumination and reflecting mirror for natural illumination. Built-in rotating color filter wheel and power indicator on rotating turret. The book - The World of The Microscope and two AA batteries included.