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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
943034	Image Sensing Systems Inc	ISNS	Measuring & Controlling Devices, Nec (3829)	411519168

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1044321	M David Greenhouse & W Austin Marxe	C/O Special Situations Funds 527 Madison Avenue, Suite 2600 New York NY 10022		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-04-27	3,300	$13.40	1,083,520	No	4	P	Indirect	By Limited Partnerships

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Limited Partnerships

Footnotes

This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology II, L.P. (Tech II), respectively. 521,168 shares of Common Stock are held by QP, 150,039 shares of Common Stock are held by Cayman, 73,741 shares of Common Stock are held by Tech and 338,572 shares of Common Stock are held by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, Tech, and Tech II is limited to the extent of his pecuniary interest.
This is a weighted average price.