Grandstream Networks GXP 1620 User Manual page 14

*Do not place near the kitchen table or humidifier, or near oil and
moisture. The device may malfunction, cause electric shock and fire.
*Do not place in humid and dusty area. The device may malfunction,
cause electric shock and fire.
*Do not place in extremely cold place or place with unstable temperature.
It may cause explosion.
*Do not place in unstable or shaky place. If the device falls it may
collapse, it may cause injury or explosion.
*Use after checking if foreign matters are attached to the speaker of the
handset. Thumbtacks, pin, stapler wires and other metallic object may
cling to the magnet of the speaker so please be careful.