Dear Sir or Madam,

Hello, I am currently evaluating the GH3011 and GH3018 sensors for a wearable device project.

While I was able to find datasheets and detailed information for the GH3011 on your website, it has been difficult to locate sufficient technical documentation for the GH3018. I would appreciate your support in clarifying the following questions:

1. What are the main differences between GH3011 and GH3018?
2. Are there any plans for discontinuation of these products? I would like to understand their lifecycle status (LC).
3. I am based in Korea and planning to develop a product using these sensors. I have seen them available through channels like AliExpress, but I would like to know if there is an official distribution or purchasing channel.
4. Since external LEDs are required, I would like to understand the recommended optical design. Specifically, I am interested in the recommended distance and placement between the sensor and LEDs (e.g., IR LED positioning). If possible, it would be very helpful to receive reference layout information similar to what is used in the GH3011EVB.

Thank you for your time and support.

Best regards,