Has anyone used these for puppy potty training?

Yes people can use these bells to train puppies but why mess with your dog's mind and emotions with this? Every time you ring a bell is your dog to pee? Why do this other than ringing the bell to let them know its times for a walk.

Could this be used for triggering say for some type of electrical device? I have an uncle that's in a wheelchair that has trouble communicating.

No. Simple bell-clasp. Consider a life alert type item for him.

What musical note do they play?

like a typical bell - hollow tone ding,ding,ding!!!

Can you mount this so it is stationary?

The bells are plenty heavy so they will remain stationary in (what I perceive as) normal use. Unless there is a concern about theft or something, or would be mounted vertically, the bells would not need to be fastened. But they certainly could be, with a very modest effort. The black base of the bell is pretty thick metal so simply drilling through would allow for a screw. Or simply wedge 2 screws against the metal on opposite sides.

ASIN	B07MV2QYML
Alarm Clock	No
Are Batteries Included	No
Best Sellers Rank	#3,476 in Office Products ( See Top 100 in Office Products ) #3 in Office Desk Call Bells #1,024 in Safety & Security
Brand	HeeYaa
Clock Form	Twin Bell
Color	Black, Silver
Customer Reviews	4.7 4.7 out of 5 stars (4,412)
Date First Available	January 15, 2019
Dial Color	black
Display Type	Analog
Frame Material	Stainless Steel
Indoor/Outdoor Usage	Indoor
Is Discontinued By Manufacturer	No
Item Weight	1.76 ounces
Item model number	G012
Manufacturer	Other
Manufacturer Part Number	G012
Material	Metal
Material Type	Metal
Mounting Type	Tabletop
Number of Items	2
Operation Mode	Electrical
Power Source	Battery Powered
Product Dimensions	3.34"W x 2.3"H
Room Type	Office
Shape	Round
Size	3.3
Special Feature	Portable
Style	Modern or Contemporary
Theme	Construction
UPC	745103923770

Call Bell 2 Packs 3.3 Inch Diameter with Metal Anti-Rust Construction, Desk Bell for Hotels, Schools, Restaurants, Reception Areas, Hospitals, Warehouses(Silver)

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