An attendee looks at a multi-functional electronic label for retail store at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

Visitors look around at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

People look at an automatic code scanning machine at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

An AI shopping guiding machine is seen at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

People visit the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

Visitors look at electronic cashier machine at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)

A staff worker introduces solutions for retails at the National Retail Federation (NRF)'s 108th annual Retail's big Show & Expo in New York, the United States, Jan. 13, 2019. The three-day NRF 2019: Retail's big Show & Expo, one of the largest of its kind, kicked off here on Sunday, where 792 exhibitors from around world brings latest technology, products and innovations for retail industry. (Xinhua/Wang Ying)