One cable cannot do two jobs here. The mini HDMI port on the Acer PM161QT carries picture only, so Acer PM161QT touch over HDMI will show an image but never register a finger. Touch and power travel over USB, which means a second cable, or a single USB-C cable that carries everything.
Quick Answer
No. Mini HDMI sends video and nothing else, so the touchscreen and the power both need a separate USB connection when you use HDMI. A laptop with a USB-C port that supports DisplayPort Alt Mode can send video, touch data and power down one cable, but check the host first. Evetech's portable monitors run from R1,799 to R45,499.
🔌 What each cable carries
Think of it as three signals sharing two possible routes:
- Video: mini HDMI, or USB-C with DisplayPort Alt Mode.
- Touch: USB only, because the touch controller reports to the computer as a USB input device.
- Power: USB, which is how a portable monitor of this kind is fed.
So the HDMI route needs HDMI for the picture plus a USB lead for touch and power. Leave the USB cable out and the monitor may stay dark or show a power warning, and touch will not respond even if the picture works.
⚡ The one-cable USB-C route
If your laptop's USB-C port supports DisplayPort Alt Mode, one cable carries video and data, and the monitor draws its power through it. Not every USB-C port does this. Some are data-only. Look for a small DisplayPort or monitor symbol beside the port, or the laptop's spec sheet.
Power is the next catch. A thin laptop port may offer limited current, and a bright portable screen with touch uses more than a dim one. If the screen flickers or restarts, plug in a separate USB power source. A phone charger and cable will do.
👆 Getting touch to land on the right screen
Once touch is connected, Windows can send taps to the wrong display when two screens are active. Open Control Panel, then Tablet PC Settings, then Setup, and follow the prompts to assign touch to the portable monitor. This is a one-off step.
🏠 Making it work on a small desk
In a Pretoria or Johannesburg flat where one desk does everything, a portable touchscreen under the main monitor holds chat, music controls or a dashboard. Two cables from the laptop to the screen add clutter, so the USB-C route saves the most space when your laptop supports it. Cable length is another detail: a 1 metre lead keeps the monitor close, while a long one trails across the desk.
🛒 Browsing portable screens
Evetech's portable monitors category runs from R1,799 to R45,499. Touch is a feature to read in the name line: the UPERFECT Unify Y 15.6" FHD Vertical Business Monitor at R2,799 lists a 5-point capacitive touchscreen. The portable monitor picks page compares options by use, and the monitor best sellers page shows full-size options.
Frequently Asked Questions
Can the Acer PM161QT touchscreen work through HDMI alone?
No. Mini HDMI carries video only. Touch and power need a separate USB connection.
Can one USB-C cable replace HDMI and USB?
Yes, if the laptop's USB-C port supports DisplayPort Alt Mode and can supply enough power.
Why is my touchscreen not responding?
Check that the USB cable is connected, then run Tablet PC Settings, Setup in Control Panel to assign touch to the right display.
Why does the screen flicker on USB power?
The port may not supply enough current. Use a separate power source.
How do I know if my USB-C port supports video?
Look for a DisplayPort or monitor symbol beside it, or check the laptop's specifications.
Adding a second screen?
Browse Evetech's portable monitors and check their ports so touch, video and power all connect cleanly.