REST doesn't have a wireless transmitter and so does not emit EMFs. It was also compliant across all rigorous manufacturing tests for its health and safety.
Typically, RF is only high enough to be of concern to humans if a device has a wireless transmitter. The approvals for devices with wireless transmitters take this into consideration and include the RF Exposure tests. REST is exempt from these tests because it does not have a 'wireless transmitter'.
It is generally assumed that unless a device has one, EMF emissions are negligible and considered safe for humans.
REST was compliant however when put through field strength emission level testing. The purpose of these tests are to ensure that emissions are within limits and the device won’t put out emissions that interfere with other devices. Although measurements and limits are not made in relation to humans, it is likely that the effects if any, are very small.