Feature: 1. Bird Call Sound Function: The balance car has a built in bird call sounder. When the cat gently touches the toy to cause it to shake, it triggers the bird call sounder, which can make a bird call to attract the cat's attention. 2. Sounder Built In Button Battery: The sounder can be replaced when the battery is exhausted, which is convenient and fast. The balance toy car will have a longer service life. 3. Self Weight Balance Movement:It adopts a self weight balance system, no electric drive is required; it will move by itself after the cat touches it; and it will shake back and forth, effectively attracting the cat's attention. 4. Built In Catnip Ball: One catnip ball can be placed on the transparent top of the toy. When the toy is shaking, the catnip ball will be randomly and attract the cat at the same time. 5. Multifunctional Balance Car: Interactive cat toys can be used to satisfy cat's play instincts, which can help reduce cats destructive behaviors, increase their IQ, and maintain physical alertness. Keep your cat alive, happy. Specification: Item Type: Cat Toy Material: Plastic Size: Approx. 6x5.5x7.5cm / 2.4x2.2x3.0in Please Allow 1-2cm / 0.4-0.8in Error For Manual Measurement Battery Type: 2 x LR41 Button Battery (Delivered With Built-In Battery) Battery Capacity: 2 x 29mAh. Package List: 1 x Balance Car Cat Toy1 x Ball Accessories1 x English Manual Note: It is recommended that cats play for 2030 minutes at a time.