What does زر سطوع منخفض look like on HTC?

On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.

When did HTC add زر سطوع منخفض?

HTC first drew زر سطوع منخفض in Sense 7, released 30 مارس 2015.

HTC Corporation has shipped 2 versions of زر سطوع منخفض. Each is dated, so you can see when the design changed.

HTC

HTC Corporation has drawn زر سطوع منخفض 2 times. Every revision HTC has shipped is below, newest first.

What does زر سطوع منخفض look like on HTC?: On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.
When did HTC add زر سطوع منخفض?: HTC first drew زر سطوع منخفض in Sense 7, released 30 مارس 2015.
How many times has HTC redrawn زر سطوع منخفض?: HTC Corporation has shipped 2 versions of زر سطوع منخفض. Each is dated, so you can see when the design changed.

HTC artwork for this emoji spans 2015 to 2016.