Product Description What makes our bathroom armrests better? Feasibility No tool installation. Installation steps: Step 1?before to usd clean and wipe thoroughly before use and the suction cup should also be cleaned to avoid dust before installation. Step 2 gently stroke the armrest before use to check the suction force. If there is any looseness open the switch again and reinstall before use. Step 3 turn on the switch and press it tightly against the wall. Press it for 5 seconds then use your palm to press the switch firmly. Be sure to press it firmly then press the switch again otherwise there will be air inside the suction cup that cannot be sucked in. Special reminder: This product is not suitable for rough gray walls putty powder walls latex paint walls breathable wallpaper and wallpaper inferior or old ceramic tiles natural marble and painted wooden boards. (Sometimes due to climate conditions there may be looseness due to thermal expansion and contraction which is a normal situation)