CLIFFORD 330.3X - Manual (Page 50)

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Additional information
Interference
All radio devices are subject to interference which could affect proper
performance.
Upgrades and Batteries
Any upgrades to this product and/or installation of batteries must be
performed by an authorized dealer. Do not attempt to perform any
unauthorized modifications to this product.
Water/Heat Resistance
This product is not designed to be water and/or heat-resistant. Please
take care to keep this product dry and away from heat sources. Any
damage from water or heat will void the warranty.