Can you set these to turn on and off via touch, instead of changing the color on touch?

Yes...as long as you understand you have to touch every light separately. The tap sequence is as follows: Red/Yellow/Aqua/Blue/Green/Violet/Light Blue/White/Jump (All Colors)/Fade (All Colors)/OFF So, you'll likely have to touch each light multiple times to turn it off. Using the remote control is probably more effective because it will turn all lights off at the same time (provided it's aimed just right), and when you turn all lights on again with the remote the previous pattern/color selection/brightness level will be retained.

How many can be hooked together?

Here's a quote from my product review that addresses your question. In my case I used a standard USB charger to provide power; the seller supplies only the USB cable and lets the user figure out how the lights are to be powered: The product's user guide doesn't recommend running more than 20 LED modules from the provided power supply (too high of a current draw). I found that when all 10 of modules in the Minimalist Pack were connected, colors like white (which uses all LEDs in a module) didn't look uniform across the set because the power supply was being strained. Adding another 10 modules (for a total of 20) made matters much worse. I ended up purchasing another power supply (adapter) rated at twice the load capacity to fix the color/brightness uniformity issue. Multiple power supplies feeding about 8 modules each could also work, as long as the electrical links between modules were arranged to avoid connecting two or more feeds together. To summarize: 20 is the maximum number of lights that can be ELECTRICALLY connected together safely, although the visual results may not be satisfactory. You can, however, link as many as you like MECHANICALLY if you buy additional USB power supplies and are careful to electrically link only 10-20 lights from each one.

Finish Type	Polished
Base Material	Acrylonitrile Butadiene Styrene
Bulb Base	E26
Product Dimensions	10.2D x 10.2W x 2.5H Centimeters
Item Weight	490 g
Lamp Type	Wall Mounted LED Decorative Lamp
Shade Colour	Multicolor
Shade Material	Acrylonitrile Butadiene Styrene
Switch Type	Remote
Style	Hexagon
Brand	Vcwtty
Colour	Multicolor
Special Feature	Colour Changing
Light Source Type	LED
Material	Acrylonitrile Butadiene Styrene
Room Type	Bedroom,Living Room,Room,Usb
Recommended Uses For Product	Decoration
Power Source	USB cable power supply
Shape	Hexagonal
Number of Light Sources	13
Included Components	Remote Control
Is Waterproof	false
Bulb Shape Size	S6
Mounting Type	Wall Mount
Wattage	37.5 Milliwatts
Number of Items	6
Lighting Method	LED
Control Method	Remote, Touch
Manufacturer	Vcwtty
Finish types	Polished
Voltage	5 Volts (DC)
Specific Uses	Color-guided learning
Special Features	Colour Changing
Batteries Included	No
Batteries Required	No
Certification	ce
EU Energy Efficiency Label	Efficient
Manufacturer	Vcwtty

Hexagon Lights, Vcwtty Smart LED Wall Lights with Remote, 13 Colors Touch-Sensitive DIY Modular Assembled RGB Wall Panels, Hex Light with USB-Power for Autism, Game Room Decor, Party (6-Pack)

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