Detachable Soft Silicone Brushes - The dog paw washer cup contains 157 dense soft silicone brushes made of food grade material, giving your puppy's chubby paws a gentle care without injury and helping to relax the paw muscles. The detachable design can also be used as a grooming brush during bath time. Rechargeable battery - The DOGNESS Dog Paw Cleaner has a built-in 2000mAh high capacity rechargeable lithium battery. It takes 2.5 hours to fully charge and lasts up to 7 days. (USB cable included, plug not included)