The PG-3660 velcro adapter is used to convert Pathway sEMG MR and TR series units for use with internal sensors PG-6330, PG-6340 and PG-6320. This adapter is also used for making external placements, using the PG-5328 24″ lead-wire , PG-7100 6″ adapter, and CMP-W21010 single patient multi use lead-wire.