Contrast
This characteristic indicates the ratio of brightness levels between the brightest white and darkest black colours that the display displays. The higher the contrast level, the richer the displayed colour palette of the display.
Brightness
The brightness of the display is determined by the brightness of the backlight and the panel throughput. The higher the brightness, the richer the image will be.
Supported file formats
All photo frames support graphic formats, the so-called. "picture" files (for example - JPEG, GIF, BMP, PNG, etc.). Often photo frames are capable of playing sound (MP3, WMA, AAC, OGG, etc.) and video files (AVI, MPEG4, etc.). These models are usually noticeably more expensive and come with a built-in speaker/speakers.
Supported memory cards
Many modern photo frames have a slot for flash memory cards. This allows you to view photos and videos, listen to music without the "mediation" of the computer. Exporting files from a PC in this case is not required - you can organize viewing of data from a camera, camcorder, etc. in a matter of seconds.
Modern photo frames support one of the following memory card formats:
Secure Digital (SD),
Compact Flash (CF),
Memory Stick (MS),
xD-Picture (xD),
MultiMedia Card (MMC).
Multimedia
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FM radio. Allows you to receive radio signals in the FM band, you can enjoy listening to live broadcasts from your favorite talk shows, news, music. The signal can be output to both speakers and headphones.
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Built-in speakers. They allow you to save on the purchase of high-quality external speakers for the photo frame (this also applies to traditional computer monitors). Although built-in speakers usually provide worse sound quality than external audio systems, they are more convenient because they do not require additional connections, equipment settings, etc. However, some photo frames are equipped with ports for connecting external audio.
— AV output. A connector that allows you to connect a portable device to a TV through a conventional RF antenna input and play the video stored in the photo frame's memory on a large screen, view photos, etc.
— Connector 2.5 mm (mini-Jack). Connector for headphones. Unlike the usual 3.5 mm jack, today it is used relatively rarely in photo frames and related devices.
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Plug 3.5 mm (mini-Jack). The standard headphone jack used in most portable players decades ago. It is widely distributed even now, including in digital photo frames.
