For details, please refer to the homepage related to this product hosted by experts, antique experts, or information from other sellers. It is a very old item. I have included images, so please take a look and evaluate. I do not know the details. There is a place to insert batteries. It looks like a ball that measures speed like a speed gun when thrown, but the power does not turn on. I am selling it as a junk item. I apologize, but I cannot answer any questions. It will be shipped by regular mail as it will not fit in a mailbox. I cannot be held responsible for non-delivery or postal accidents. This is for those who are okay with that. Discounts and price reductions are not possible for this product. I will refrain from responding to comments asking for discounts or price reductions. Thank you for your understanding. I have included many images, so please be sure to check them. Please look at the images carefully to avoid any problems. Please refrain from purchasing if you are sensitive to such things. Please be sure to read the profile before purchasing. We cannot provide any guarantees or compensation for those who have not read the profile. That's all, only for those who are okay with the above. #SpeedGun