Nokia 12 GSM MODULE REMOTE I/O - Manual (Page 53)

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• Do not drop, knock, or shake the device. Rough handling can break internal
circuit boards and fine mechanics.
• Do not use harsh chemicals, cleaning solvents, or strong detergents to
clean the device.
• Do not paint the device.
• Use only with properly authorized antennas. Unauthorised antennas,
modifications, or attachments could damage the device and may violate
regulations governing radio devices.
If the device is not working properly, take it to the nearest authorized service
facility for service.