An ambient device is a wireless object which unobtrusively presents information.

In an ambient temperature. In a secure case which will protect the device from accidental damage

The iPod touch has an Ambient Light Sensor at the top of the device that detects how much ambient light the environment has and adjusts the brightness of the device accordingly to make things more viewable in different lighting conditions.

it turns off the device when temperature rises beyond the ambient temperature

It is a light-weight device that connects to the microphone or microphone stand. It is used to shield the microphone from any ambient noises in the surroundings.