1. please ensure power supply from customized socket.

2. unplug from the socket in case of no use

3. never touch power plug with wet hand

4. never sleep during use of the product

5. please consult doctor first in case of acute swelling or bleeding with the knee

6. patients suspected with swelling, bacterial infection or other special inflammation shall consult doctor first

7. upon more severe pain, stop use and contact the customer service center

8.don't directly touch skin, but wear on underpants or the given safety pad.

9. the  shining part may result in burning upon touch to electric wire, cotton fabric, plastic or other flammable materials, for your special attention.