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Review Contents
Highly Recommended Projector
Ease of Use
Intended Use:
Mobile Presentation
ASUS S1 Projector ASUS S1
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Street Price: $239
Weight: 0.8 lbs
Aspect Ratio:16:9
Lens Shift:No
Lamp Life:30,000 Hrs
30,000 (eco)
Connectors:  HDMI (MHL), Audio Out, USB
Video Formats:  480i, 480p, 720p, 1080i, 1080p/60, 1080p/50, 576i, 576p

Pocket Projector Review

Marc Davidson, May 15, 2014

Key Features

Highly portable. The S1 measures 1.2" x 4.4" x 4.0" (HWD), and weighs just 13 ounces with its rechargeable battery. That may be all you need to carry, since the fully charged battery is rated at 3 hours in the S1's Battery mode. Add the power block, supplied HMDI cable, and soft carrying case the S1 comes with, and it's still only 1.75 pounds.

Low running costs. ASUS rates the light source at 30,000 hours, which means it should last the life of the projector.

Surprisingly capable audio system. The 2-watt mono speaker offers good sound quality and enough volume for a small room. You can also plug a headset or external audio system into the mono audio output.

Test Results

Brightness. Using AC power, I measured the S1 at 150 lumens in its brightest predefined image mode and at 127 lumens in Theater mode. That makes it bright enough for a 30" to 35" image for extended viewing in moderate ambient light, or a roughly 45" to 65" image in theater dark lighting. The 52" image I settled on for testing is also quite watchable for short sessions in moderate ambient light.

Using battery power, the brightness dropped to 108 lumens in Presentation mode and 71 lumens for the low power Battery mode. That translates to being suitable for roughly a 20" to 25" image for long sessions in moderate ambient light.

Good brightness uniformity. The projector did an even better job maintaining uniform brightness than its 78% uniformity measure suggests. The dimmest and brightest areas were far enough apart, with the brightness changing gradually enough, that I couldn't see any difference even with a solid white screen.

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Comments (9) Post a Comment
Claude Posted May 29, 2014 2:22 PM PST
I thought LED lighting eliminated the rainbow effect ? Is that not correct ?
Evan Powell, Editor Posted May 29, 2014 2:36 PM PST
Claude, that is not correct. Sometimes it can make it worse. The LED light source functions by alternating red, green, and blue in temporal sequence, just like a color wheel does, and that's what causes the problem.
Wayne Posted Jun 2, 2014 8:46 AM PST
I'm interested in the reviewer's discussion of brightness and the term "moderate ambient light". Does that mean it can be used in hotel hallways outside conference rooms? The lighting in such places is softer than office lighting, but certainly not "theatre dark".

If I'm showing slides on the wall outside the conference room, for people to glance at as they arrive, will they see something useful?

Given the above, I'm disappointed that the projector doesn't have connectivity for USB thumb drives, SD cards or WiFi.

Does anyone have suggestions for a projector that's bright enough and better connected?

Ignacio Posted Jun 6, 2014 9:01 AM PST
I've had a brookstone hdmi projector for 2 years now, it's a great little projector that has served me great but I am looking for an upgrade within the same dimensions. I certainly welcome the added lummens but I wonder if there is a projector this size with 720p resolution? Also can you comment of the fan noise compared to the brookstone?
Tim Thompson Posted Jun 17, 2014 7:50 PM PST
Does it have a fan? How noisy is it?
Dare Posted Oct 14, 2014 10:31 PM PST
The asus S1 has no built-in wireless connectivity however, I saw a video on youtube that demostrated how it can be used with an ASUS wireless dongle plugged into its HDMI port.

Does anyone know which dongles are compartible with it? I'll really like to be able to connect my laptop and phone to it wirelessly for ease.
Greg Green Posted Dec 17, 2014 10:05 AM PST
What resolution do I need? I have the projector and all it is showing is the desktop background. Nothing else shows up.
Samuel Onyiego Bosire. Posted Nov 2, 2015 7:33 AM PST
I bought Asus S1 pocket projector. I connected it to my laptop using the HDMI cable, it doesn't show any picture, just writes NO SIGNAL. What might be the problem?.
Evan Powell, Editor Posted Nov 2, 2015 7:48 AM PST
Samuel, typically it is because your laptop does not automatically output a video signal via HDMI until you tell it to in the display settings.

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