窃听器

窃听器	qiè tīng qì	tapping device / bug
窃	qiè	to steal / secretly / (humble) I
窃听	qiè tīng	to eavesdrop / to wiretap
听	yǐn	smile (archaic)
听	tīng	to listen to; to hear / to heed; to obey / a can (loanword from English "tin") / classifier for canned beverages / to let be; to allow (Taiwan pr. [ting4]) / (literary) to administer; to deal with (Taiwan pr. [ting4])
器	qì	device / tool / utensil / CL:台