I'm thinking five. One mini wired mouse I bought for laptop, two Logitech M720 Triathlon (I thought one stopped working, so I ended up with two. Best mouse ever, btw), one wired for PC in case I have to set up some shit and wireless is not possible and one that came with Keychron K2HE.
Can you tell we have a waste problem in 'Merica? I donated probably three or four over time.
How many "atomic" clocks do you have?