Features: Suitable for middle school physics course experiment teaching. Used to explain the basic structure and working principle of four - stroke single - cylinder diesel engine. Two ways of using, manual or connecting power supply. Already assembled, easy to use. Compact design, making it convenient for demonstration. Specification: Material: Plastic and Metal Size: As the picture shown Battery: 2 x 1.5V AA battery (NOT included) Base length: Approx. 17cm or 6.69inch Width: Approx. 11cm or 4.33inch Height: Approx. 30.5cm or 12inch Weight: Approx. 766g Package Included: 1 x Diesel Engine Model 1,Suitable for middle school physics course experiment teaching 2,Used to explain the basic structure and working principle of four - stroke single - cylinder diesel engine 3,Two ways of using, manual or connecting power supply 4,Already assembled, easy to use 5,Compact design, making it convenient for demonstration Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.