eight : About 4kg?Case size: W51×D42×H20cm? Accessories: Belt, Exchangeable Blood Vessel, Storage case Built-in lamps, chime sound and a buzzer indicate correct or incorrect injection into the three main veins: Basilic vein, Cephalic vein and Median cubital vein. Features 1.Built-in lamps, chime sound and a buzzer indicate correct or incorrect! (Can be used for a test) 2.Blood circulates by an electric pump. Can check back flow.