[Expired]RENPHO Lynx Smart Ring

: How accurate are the heart rate, blood oxygen, and sleep monitoring functions of this ring? 这款戒指的心率、血氧、睡眠监测准确度如何？

: Smart Health Ring 智能健康戒指

: IQ Test Ring 智商测试戒指

: This is a rip-off. I once invested in something similar. The cost was about 25-50 RMB, and there was no technology whatsoever. Later, it didn't sell particularly well, and I withdrew my shares once someone injected capital. 这个智商税，我投资过一个类似的，成本大概25-50人民币，毫无技术可言，后来卖的一般，有人注资我就撤股了。