1. Pour water to 2/5 barrel and put 450g (steel ball or material) with jewelry. Then add 10g polishing solution. 2. Select a tempo by rotating the specific tempo control button. 3. Press the button, which is one-way rotation. 4. Press the button, it is a two-way rotation. It turns in one direction for about 1 minute, then automatically turns in the opposite direction for 1 minute. We recommend bidirectional rotation, which is more effective. Disclaimer: There is a stop section for 5s during two-way rotation. After stopping, the barrel automatically rotates in the opposite direction. During stop, can't press the button to rotate in one direction only. Otherwise, the machine turns off and does not work. Then it needs to press the button to return to work normally, and then press the button to rotate in single/one-way direction., Manufacturer: MMHHHG