reflected signal indicator

例句：

1. 1. The device is designed to reflect the user's handwriting on a screen.
   该设备设计用来在屏幕上反映用户的手写。
2. 2. The engineer used a reflected signal indicator to detect the fault in the circuit.
   工程师使用反射信号指示器来检测电路中的故障。
3. 3. The company introduced a new product that uses a reflected signal indicator to improve efficiency.
   该公司推出了一款新产品，利用反射信号指示器来提高效率。