Vacuum Therapy Machine, Unsvorns BBL Vacuum Cupping Massager with 24 Vacuum Cups, Valentine's Day Gifts for Her, Mothers Day Gifts USAGE NOTICE: When you are testing, you need to attach the cup to your skin to generate negative pressure. Please turn on the two red switches at the top of the machine before use. The left side is the pressure control switch(Must be opened), and the right side is the mode control switch. The left knob of the machine is the pressure adjustment switch, and the right is the mode adjustment knob. Multi-Function: Different sizes correspond to different functions. Please use them according to the actual situation. Thank you. Easy to Use: We provide detailed product instructions. Proposal: Please refer to the manual for use, thank you!