2pcs/lot EE-SX670-WR photoelectric switch Used for smoke alarm to count the number of movements of the mechanical arm
https://www.vogueparade.com/shopping/EN/150412/1/1005003420104132/2pcslot-ee-sx670-wr-photoelectric-switch-used-for-smoke-alarm-to-count-the-number-of-movements-of-the-mechanical-arm//