Most of them just have a slot for your room key to turn on the electricity and/or A/C, but many times it is a physical which i.e. it doesn't care what gets stuf

Most of them just have a slot for your room key to turn on the electricity and/or A/C, but many times it is a physical which i.e. it doesn't care what gets stuffed into the hole and often there is some kind of brochure that can be folded/ripped into card shape to trip the switch.