Features 1、With signal output indication, single-channel signal output, output effective signal is low level 2、The module can be connected to a relay to form functions such as limit switches, or it can be connected to an active buzzer module to form an alarm. 3、Widely used in motor speed detection, pulse counting, position limit, etc. 4、Small size, easy to carry and store, easy to use and with good performance 5、Strict quality control and quality assurance, high safety factor, can be used with peace of mind Specification Item Type: Infrared Photoelectric Sensor Module Size: Approx.12.5mm / 0.5in, 10mm / 0.4in, 20mm / 0.8in, 23mm / 0.9in Main Chip: For LM393, cross-beam infrared head Working Voltage: DC 5v Output Form: Digital switch output (0 and 1) Use Wide Voltage LM393 comparator Package List 10 x Infrared Photoelectric Sensor Module