To maintain optimal performance, please follow these steps for maintenance after each use: STEP 1: Immerse the LEFEET P1 (ensuring it is securely fastened with the main unit and the battery*) in a container filled with clean fresh water (not seawater) for 30 minutes. STEP 2: Hold the handles with both hands, switch it on at a slow speed for one minute, and repeat this process 2-3 times while the product is fully submerged in water. STEP 3: Dry the main unit with a soft, clean, dry cloth. STEP 4: Loosen the ring connecting the battery and main unit with dry hands, and remove the battery. STEP 5: Allow the main unit and battery to dry completely in a cool, ventilated area. *Securely fastened means that you will be able to pair it with the remote control and not showing loose connection