Puxing PX-578 Manual page 20

If you are not using a body-worn accessory and are not using the radio in the intended
use position in front of the face, then ensure the antenna and the radio are kept at least
2.5 cm (one inch) from the body when transmitting. Keeping the radio at the proper
distance is important because RF exposures decrease with increasing distance from
the antenna.
Use only Xiamen Puxing Electronics Science&Technology Co., Ltd approved
supplied or replacement antennas, batteries, and accessories. Use of
non-manufacturer-nameapproved antennas, batteries, and accessories may exceed the
FCC RF exposure guidelines.