An automatic throwing machine for pet balls is a device designed to entertain pets by automatically launching balls for them to chase and retrieve. These machines are commonly used for dogs, cats and other small pets as well.  

The throwing machine usually consists of a launcher mechanism and a ball compartment. The launcher may be operated by a motor or a spring-loaded mechanism.

Balls are stored in a compartment or a hopper attached to the machine. Some machines can hold multiple balls at once, allowing for continuous play.

SPECIFICATIONS 

1. Design: The throwing machine usually consists of a launcher mechanism and a ball compartment. The launcher may be operated by a motor or a spring-loaded mechanism.

2. Ball Storage: Balls are stored in a compartment or a hopper attached to the machine. Some machines can hold multiple balls at once, allowing for continuous play.

3. Launch Mechanism: When activated, the launcher propels a ball forward, simulating a throw. The distance and speed of the launch can often be adjusted to accommodate different sizes of play areas and pets.

4. Safety Features: Many automatic throwing machines include safety features to prevent accidents. These may include motion sensors to detect when pets or people are too close to the machine and automatic shut-off mechanisms.

5. Remote Control or Automatic Operation: These models come with a remote control, allowing owners to initiate the launching sequence from a distance. Others may operate automatically on a timer or when triggered by a motion sensor.

6. Power Source: These machines typically require a power source, such as batteries or an electrical outlet. Battery-powered models offer more flexibility in terms of placement, while electric models may provide more consistent performance.

7. Indoor and Outdoor Use: Depending on the design and materials used, some throwing machines are suitable for both indoor and outdoor use. Waterproof or weather-resistant models are ideal for outdoor play.

8. Training and Interaction: Automatic throwing machines can be used to facilitate training and exercise for pets. Many dogs enjoy chasing and retrieving balls, and these machines can provide a fun way to engage with them and keep them active.