The gate includes an operational indicator light, stand rod with screw thread, M6 bolt for attachment to a roller track (U35001) and connector lead with 8 pin miniDIN plugs.Lab Supplies, Photo Gate It then acts as a wide-range light barrier, allowing it to be used at sporting events, for example. Infrared for triggering the 3B NETlog unit (U11300) or a digital counter (U8533341).Barrier spacing: 82 mmRise time: 60 nsSpatial resolution: It can be operated in internal mode using the built-in infra-red light source or in external mode with the aid of a laser pointer, which needs to be obtained separately.