This is the next generation Pro Analog Transducer Box which is a smaller and lighter version than the previous analog transducer box. Just like the past analog transducer box, this is an additional method of connecting analog sensors into the V-Net recorders. Each Pro Analog Box will house up to four of the Plug-In style transducer modules. The box is then connected to a single V-Net cable. plug-in style transducers and adapter modules must be purchased separately.