This feature automatically cleans the filter and doesn't need the user to replace it.
3% have it
17. has a HDMI output
Devices with a HDMI or mini HDMI port can transfer high definition video and audio to a display.
83% have it
18. has manual focus
This allows to manually set the focus.
71% have it
19. zoom ratio
Projector zoom allows you to increase or decrease the size of the projected image without moving the projector. Bigger zoom ratio provides more flexibility. The most common zoom ratio among today's projectors is 1.2. With a 1.2 zoom ratio you can vary the image size by 20% by simply adjusting the zoom lens.