The sensor, labeled 'A', captures angles in all three axes. It is comparable in both size and weight to a box of matches. This sensor is strapped either to the left side of the patient's head for Cervical ROM evaluation or at the T12 vertebra for Thoracic and Lumbar ROM evaluation.

The sensor, labeled 'B', also captures angles in all three axes. This sensor is held at T1 vertebra for Cervical and Thoracic ROM evaluation or at S1 vertebra for Lumbar ROM evaluation.

A simple coiled cable with locking phone-jack connectors is used to connect the two sensors together.

Both of the sensors are powered with a single USB cable. This further simplifies the Q-ROM system by reducing the number of power cables and never having to worry about recharging the batteries.