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Delivery took about 44 days. There is a suitable size double-sided tape inside a box which can be used to attach the button to a wall/table. To replace the CR2032 button battery, one needs to lift slightly small plastic lock and turn a back lid counter-clockwise. When the button is attached with the tape to a surface, be sure to remember where the small plastic lock is, so you can replace the battery by opening the case with small flat screwdriver or paperclip and turn the front lid anti-clockwise.