Hello   @Ltwalsh 

The switch making a clicking sound could be due to improper wiring. 

Please follow the HS200 installation video here to and examine the wiring of HS200 step by step: 
https://www.tp-link.com/support/download/hs200/v1/

Make sure the wires are not loose. 

If you have connected HS200 to the Wifi network and its switch keep reboots, you could turn Wifi off first check the suggestions in post HS220 Rebooting solved shared by the community user.