The DL-1 is a small 100 watt dummy load. The unit is designed such that it can easily switched in and out of the transmission line. The standard connectors for the unit are "N" type. The unit pictured here has "N" to PL-259 converters installed. These unit sells for $200 (08/00) in the Collins Collectors market. Not much you can say about a Dummy Load except "it works".