The pick-up process was similar to renting a car, including the need to flash a driver's license.

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To combat showrooming, retailers are in the process of deploying omni-channel strategies, such as buy online and pick up at the store.

FORBES: Can Omni-Channel Retail Combat Showrooming?

Ms Hersman said they were now following up two lines of inquiry - the actual cause of the short circuit, and why the certification process failed to pick up the defect in the battery's design.

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