Dear friends, welcome to store. It's a great honor to meet you. Hope you have a nice shopping experience here. 2*AAA Batteries (not including)Features:1. Battery: this toy is powered by 2 pieces of AA batteries and it does not contain battery so that you need to prepare.2. NoteL the colors of the ball and feather is various and random to deliver and they can not be chosen so please not to purchase if cautious.3. First, disconnect the ball from the middle, put two AA batteries into the battery box according to the positive and negative poles, open the switch, and then close the cover. (note: the battery should be installed in the opposite direction, not misled by its spring) the left positive pole should be outward and the right negative pole should be outward.4. When playing in the water, it is better not to spend too long (half an hour is appropriate), because the ball may sink into the water for too long in the water.5. When the switch is turned on, the ball will automatically roll irregularly, which can attract your cat to play and love it.6. When not playing, pour out the water in the toy ball, take out the battery and dry it in a dry place.7. The ball toy can be played in the water and on the floor, electric-saving and waterproof.Notes:1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors.2. Due to the screen difference, the color may be a little different from what you expect, please allow it.If you have any questions about this product,please don't hesitate to contact with us!We will respond within 24 hours and solve the problem for you. Thank you for your buying!