美国公园手表公司为防止儿童在公园里与父母走失,特地开发了一种可以让父母判明子女去向的防儿童走失的装置。 这种形似手表的佩戴装置已在美国科罗拉多州丹佛附近的主题公园内投人使用。它能向分布于此园内的14处天线发射小功率的信号。凡在园内单独走动的儿童,只需佩戴上这种 In order to prevent children from getting lost in the park with their parents, American Park Watch Company specifically developed a child-resistant device that allows parents to identify their children’s whereabouts. This watch-like wearable device has been used in a theme park near Denver, Colorado, USA. It can transmit low-power signals to 14 antennas distributed in this park. All children walking alone in the park, just wear this