Samsung SWC-R640LBAXAR - Manual (Page 209)

Health and Safety Information 204
Cleaning solutions
Do not use harsh chemicals, cleaning solvents, or strong detergents
to clean the mobile device. Wipe it with a soft cloth slightly
dampened in a mild soap-and-water solution.
Shock or vibration
Do not drop, knock, or shake the mobile device. Rough handling
can break internal circuit boards.
Paint
Do not paint the mobile device. Paint can clog the device’s moving
parts or ventilation openings and prevent proper operation.