A. Speaker function: The speaker function adds more bass and volume, capable of producing the kind of loud fart sounds you want. With this device, when you're in a bad mood, it may embarrass your "target". Hide the speaker and press the remote control at the right moment. B. Multi - functional toy: If someone makes you unhappy, you can use it to play pranks, which may make him angry. It's interesting and is a funny toy worth owning. C. Applicable occasions: It is suitable for various parties such as birthday parties, April Fools' Day, Valentine's Day, Christmas, Halloween, etc., and can be used as a holiday gift for children and family members. D. Realistic effect: This interesting remote - controlled fart box can simulate the sound of farting and is a good party prank toy. E. Suitable for adults and children: Specifically designed for children aged 9 - 15 and all adults (for reference only). The fart box is powered by 4 AA batteries (batteries are not included in the package). Dimensions: 12 x 11 x 4.2 cm. Specifications: Material: Plastic Product color: Black Package dimensions: 25 x 17.5 x 6 cm Package weight: 165 grams Batteries: Fart machine: 4 AA batteries (not included in the package), Remote control: Button battery (included in the package) Package contents: 4 fart machines 1 remote control