Wide application---fart machines are very funny tricky toys to be applied in your home, school, classroom, elevator and other places; just using them to trick others Simple to make fart sound---just make the vent face about 2 - 3 cm behind the end of your thumb, and then press hard, finally you can hear the fart sound. Besides, you can adjust position and speed to produce different fart sounds, which is very easy and interesting Simulate fart sound---simulate fart sound, soft rubber device produces gas, a very interesting tricky and funny toy for children kids. Squeeze to create a highly simulated farting sound, will have everyone cracking a smile. Suitable for home, school,or even in the office. High quality---high quality and flexible rubber material manufacturing ensuring maximum durability and safety for children play. Special designed for children above 3 years old to play, wonderful gift and suitable for party entertainment. Size---about 4.5 x 4.4cm of the size, proper size and durable, can withstand endless hours of play.