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Graffiti smart home design Attention: 1. Our company cannot bear the costs incurred due to non quality issues; 2. Please do not leave the mechanical key indoors. Our company cannot bear the cost of unlocking due to not carrying the mechanical key; 3. The additional costs caused by the malfunction (including but not limited to: secondary installation fees, unlocking fees, door or other property damage, lost working hours, hotel room opening, etc.) cannot be borne by our company as they are not directly related to the product. Please be cautious if you mind. (Lithium battery warranty for vulnerable parts of batteries for six months)