What a marvelous Science toy!
This is an interesting model toy, this stirling engine model uses the temperature difference between the top and bottom plates to drive. Put it on the cup which full with hot waters, give the flywheel a gently push, and get the flywheel going, and then it works like charm.

Quick Start and Precautions:
1️⃣Place the engine on a flat table and add hot water with more than 4/5 capacity of the cup into the flat cup with a mouth less than 88mm.
2️⃣The engine will not start automatically. Under the premise of enough safety, place the engine on the mouth of the cup and heat it for about 20 seconds, then move the flywheel clockwise by hand until the engine runs.
3️⃣ It is forbidden to add oil into the engine cylinder, piston, bearing, connecting rod and other moving parts!
4️⃣The engine can run with only a very small temperature difference between the top and bottom, anything hotter than boiling water will damage the device. Do not place it on any objects with high temperature (stove, wood burning fireplace, candle, etc.), otherwise many parts of the engine will be melted. The highest temperature to run the engine should not exceed 100°C(212°F).
5️⃣The continuous and constant temperature of the heat source on the constant temperature plate should not exceed 60°C(140°F).

Features:
1️⃣Micron precision Borosilicate glass cylinder and Graphite power piston
2️⃣Both connecting rods are positively located using low friction POM and stainless steel screws
3️⃣Ultra low friction demagnetised and de-greased bearings, NO lubrication required
4️⃣The hollow brass pillar and the plastic screw on the bottom plate provide unexpectedly high heat insulation performance
5️⃣Fully CNC machined, giving crisp, clean and tidy edges all over

Package:
1 x HZZ92 Pro Stirling Engine
1 x User's Manual