DS-RB40: 
D.S.P.P Reflective Beam Sensor
Distance: 40 Feet
 
Specifications:
Detection Method: Retro-Reflective
Angle: 1.5
approx. Max. Sensing Range: 40 Feet (12 m)
Supply Voltage: 12-30VDC/10-25VAC
Output: Relay SPDT
Output Capacity: 3A/24VDC,3A/120VAC
Protection Degree: IP66