[ad_1] Visitors look at flexible displays during the 2019 Universal Display Expo held in Shanghai. LYU LIANG/FOR CHINA DAILY SHENZHEN-For one South China-based company, its walkie-talkies have to pass repetitive drop tests and button-pressing trials to meet factory inspection standards. At Hytera, a leading walkie-talkie maker in Shenzhen, Guangdong province, most tests used to be conducted