Many of my clients with limited fine-motor control enjoy pressing a switch to activate a desired result such as turning on music, a fan, vibration or light. Some individuals with higher cognitive abilities can turn their head to hit a switch that activates a recording of a joke. Some clients enjoy the combination of "cause and effect" devices with fine motor activities such as ring stacks and insertion tasks. They love all the sensory stimulation!
I set up a table with a control panel that plugs into a wall outlet. The control panel was provided by the American Printing House for the Blind free for clients with legal blindness. Check out: https://www.aph.org/
Switches and adapted toys are sold on Amazon or via special needs websites such as Enabling Devices at https://enablingdevices.com/
The devices shown in the following videos all plug into electric outlets and use AC current. However, some battery operated toys are sold adapted to be used with switches. Another option is to purchase a battery interrupter. The latter is much less expensive and versatile!
The copper piece is placed between batteries and the connection and the switch male plug is attached to the female end of the battery interrupter. (sorry to be so graphic...…)
Source: Multi-sensory Switch Activities for Individuals with Developmental Disabilities by RecyclingOT
Source: Sensory Lamp Ring Stack for People with Autism Spectrum Disorders by RecyclingOT
Here are a few links to related products. I earn a few cents when you shop on amazon via these links!