... 3v or 5v Operating distance:2m INFRARED (IR) LASER TEST CARDBy converting kinds of invisible near infrared ... wavelength beam into visible light, IR Laser Test Card is able to detect, track, proofread ... lifetime etc. It functions with 1mW of IR Laser sources, efficient excitation wavelength arrange mainly from 800nm ... , No. 8 , Dongzhou Rd , Dongjing, Songjing, Shanghai, P.R. 201619,China