A visitor walks past a television displayed at the booth of Philips during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

Visitors experience 4D technology at the booth of Samsung during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

Visitors compare the image quality of a QLED 8K television with a 4K television at the booth of Samsung during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

A visitor experiences shaving products at the booth of Panasonic during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

Photo taken on Aug. 31 shows a vacuum cleaning robot "Roxxter" displayed at the booth of Bosch during the 2018 IFA consumer electronics fair in Berlin, capital of Germany. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

People visit the booth of Sony during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

Photo taken on Aug. 31 shows a view of the main entrance of the 2018 IFA consumer electronics fair in Berlin, capital of Germany. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)

A visitor experiences VR game at the booth of Euronics during the 2018 IFA consumer electronics fair in Berlin, capital of Germany, on Aug. 31, 2018. The IFA 2018, which attracts 1,814 exhibitors from all over the world, kicked off on Friday and will last until Sept. 5. (Xinhua/Shan Yuqi)