【Indications】 This cold cryotherapy machine provides natural pain relief for post-major knee surgery (eases pain/swelling, avoids painkiller dependence).Post-operative knee pain, ACL injuries, swelling, sprains, other injuries. Ice Machine for Knee has adjustable cold levels, an on/off cycle timer (safe for sleeping), low noise, leak-proof TPU material, 12.7Qt large capacity (frozen bottles extend use), easy operation, and foldable design for storage. 【Directions】 Put ice and fill water to the fill line, Hook up the tube, put the pad on knee, Select time and flow, press the on button and enjoy the relief. No worries on having to refreeze anything or it being too cold, you can adjust to your comfort