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device is called“Nettox”,which combines the words“internet' and“detox(戒瘾)”.Users wear it on their arm.The device has a sensor that measures hemoglobin(血红蛋白)oxygen levels and changes of the heart rate called HRV.Studies have found that u- sing a mobile phone for long hours can lower HRV levels.The Nettox device makes a sound when HRV and blood oxygen levels fall,which reminds wearers to stop using their phones. For people between the ages of 18 and 25,the HRV should stay above 60.At a recent trial,Tyas's HRV reading was 44 Internet addiction is a growing social issue in Indonesia.In Octo- ber,two teenagers were treated for their addiction to internet gaming,media reported. Irfan Budi Satria's team is now working to improve Nettox's