Relm Sigtronics PRA-1601 for 500 B, RSP-500 models Code: PRA1601 Price: $208.00 Quantity in Basket: none Sigtronics PRA-1602 for WHS450, MPU Series, MPV Series, SCV and SCU Series Code: PRA1602Relm Price: CALL FOR GUARANTEED LOWEST PRICE. Quantity in Basket: none Sigtronics PRA-1603 for RPU/RPV-416, RPU/RPV-516, RPU/RPV-499, RPU/RPV-599, RPU/RPV3000, RPU/RPV3600 Code: PRA1603 Price: $227.00 Quantity in Basket: none