Feature 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 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 + Metal Size: As the picture shown Battery: 2 x 1.5V AA battery (NOT included) Base length: Approx. 17cm / 6.69inch Width: Approx. 11cm / 4.33inch Height: Approx. 30.5cm / 12inch Weight: Approx. 766g Package Included: 1 x Diesel Engine Model