This collaco silicone light will glow when you hit it. Brightness Adjustment: You can adjust the brightness to your preferred level. Battery: Uses 3 AAA batteries. Batteries and USB cables are sold separately. We do not accept returns or exchanges for products other than defective products. This product is a miscellaneous goods and does not come with a warranty. If products failure occurs within half a year from the date of shipment, we will deal with exchanges. In the event that the product is defective, please contact us to inquire the condition of the product.