日本北阳HOKUYO光电传感器BWF-11B 日本北阳HOKUYO光电传感器BWF-11B BWF-11/21/31/41 Optical Data Transmission DeviceSerial type High performance in compact and light weight of handy size, 44 x 84 x 130.3mm! Long distance, 100m and 200m! 400m type is also available in the same size!