Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 12, 2020
Cover [Abstract]
Entity Registrant Name	Zoom Telephonics, Inc.
Entity Central Index Key	0001467761
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Incorporation State Country Code	DE
Entity File Number	0-53722
Entity Common Stock, Shares Outstanding		23,891,142
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2020