Also, a bit level device may refer to a device that considers the data it deals with opaque, i.e. it doesn't care about the semantics, or meaning, of the data.

Bit level device has several meanings, which can be separated by considering their antonyms:

A bit level device provides its output in binary format, whereas a pulse level device outputs raw voltages. A digital circuit or computer needs a separate controller or converter device to receive information from a pulse level device.

A bit level device considers the data a continuous stream of information, whereas a packet level device divides the data into packets.

A bit level device sends and receives data one bit at a time. A byte level device sends and receives data a byte at a time, a word level device sends and receives a word at a time, etc.